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The Helvy Journal
No broscience. No clickbait. Every claim links to NHS, NICE, BMJ, or PubMed. Written by Helvy and grounded in UK clinical guidelines.
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Showing 183 guides.
Start here15 science-backed biomarkers that predict biological age and healthspan — from hs-CRP and ApoB to homocysteine and DHEA-S.
Everything a blood test can reveal — vitamins, hormones, thyroid, diabetes, heart disease, liver and kidney function, inflammation, and cancer screening including the Galleri trial.
Which blood tests require fasting, how long to fast, what you can drink, and what happens if you accidentally eat beforehand.
Everything you need to know about blood testing — what gets tested, why it matters, and what your results actually mean.
A clear breakdown of private blood test costs in the UK — prices by test type, what the NHS covers for free, and hidden costs to avoid.
Evidence-based testing schedules for healthy adults, athletes, and those managing conditions. NHS Health Check frequency vs private testing.
What 50+ biomarkers reveal, NHS Health Check vs private panels, how to read results, and how to choose the right test for your goals.
Understand your blood test results in plain English. What each biomarker means, what reference ranges really tell you, and when to act.
Red cells, white cells, platelets, haemoglobin and MCV explained in plain English. NHS reference ranges, what abnormal results mean, common patterns, and when to act.
MCV measures the average size of your red blood cells. What a normal MCV is, what low (microcytic) and high (macrocytic) results point to, and how to test the cause.
Your GP said your blood tests are normal but you still feel unwell? 10 biomarkers in the grey zone — ferritin, TSH, vitamin D, B12, HbA1c and more — NHS vs optimal ranges, 5 result patterns, and what to do next.
The useful markers your GP rarely runs, why they are left out, and how to fill the gaps privately without duplicating what the NHS already covers.
Why homocysteine rises when B12, folate or B6 run low, its links to heart and brain health, optimal vs standard ranges, the MTHFR question, and how it is usually lowered.
How PhenoAge, GrimAge and UK Biobank algorithms estimate biological age from 9 routine blood biomarkers.
Do testosterone boosters actually work? An evidence review of zinc, vitamin D, magnesium, ashwagandha, fenugreek, tribulus and D-aspartic acid — what's worth it, what's a waste, and why measuring beats guessing.
Lifting weights gives a real but short-lived testosterone spike; over months the effect on your resting level is small. The bigger lever is losing fat, while endurance overtraining can lower it. The honest evidence and the markers to measure.
Testosterone drives muscle protein synthesis, but within the normal range your training, protein and sleep matter far more than your number. When low testosterone is the real ceiling, how to tell, and the markers to measure.
No — controlled trials show creatine does not raise total or free testosterone, and the 2025 hair-loss RCT found no effect on DHT. Where the myth came from, what creatine actually does, and how to measure your real testosterone.
Does lack of sleep lower testosterone? Yes — most of it is made during sleep, and one week of 5-hour nights dropped levels 10-15% in a JAMA trial. The sleep apnoea link, how much sleep you need, and how to measure your real testosterone.
Normal testosterone levels for men and women by age in nmol/L. BSSM clinical thresholds, the grey zone explained, free T vs total T.
UK labs report testosterone in nmol/L; US sites use ng/dL. The exact conversion factor, a quick table, and what counts as low in both units.
A male fertility blood test measures the hormones that drive sperm production — testosterone, LH, FSH and prolactin. How it works alongside a semen analysis, what high or low FSH means, the TRT trap, and the UK pathway.
Belly fat and low testosterone feed each other. How body fat lowers testosterone through SHBG, insulin and aromatase, how much losing weight raises it, and the markers that show where you stand.
What the 'male menopause' actually is, the symptoms, and the blood tests that show whether falling testosterone is behind them — total and free testosterone, SHBG, LH, FSH and prolactin.
Fatigue, brain fog, low libido, weight gain — 12 symptoms of low testosterone explained. BSSM thresholds and evidence-based fixes.
Low testosterone is a symptom, not a cause. The real reasons behind it — body fat, sleep apnoea, type 2 diabetes, medication, steroids, testicular and pituitary problems — and how LH and FSH show where the fault sits.
Low testosterone under 40 is rarely ageing. The real causes (body fat, sleep, steroids, varicocele, medication), the symptoms, the blood tests that find the cause, and why fertility makes early testing matter.
High testosterone in men is almost always from steroids or a TRT dose set too high, not the body overproducing. The symptoms, the real risks (polycythaemia, oestradiol, fertility), and the blood tests that find the cause.
A low sex drive is often a hormone or health signal, not just stress. The blood markers that explain it in men and women — testosterone, free testosterone, SHBG, prolactin, oestradiol, thyroid, iron and blood sugar — and what to do with your results.
ED is rarely just in your head. The hormone, metabolic and vascular markers that explain it — testosterone, free testosterone, SHBG, prolactin, HbA1c, cholesterol and thyroid — why ED is an early warning for your heart, how to test accurately, and when to see your GP.
Enlarged male breast tissue is usually a hormone balance problem. The blood markers that matter — oestradiol, testosterone, SHBG, prolactin, LH, FSH, thyroid and liver — red flags, and what your results mean.
Sleep, strength training, body fat, zinc, magnesium and vitamin D — the natural ways to raise testosterone that have evidence behind them, and the ones that don't. Plus why testing beats guessing.
The foods that genuinely support testosterone — zinc, vitamin D, magnesium and healthy fats — the low-fat diet trap, the habits that lower it, and why a blood test tells you what your body actually needs.
Yes, but how much depends on how much you drink. What the research shows about alcohol and testosterone, the difference between one heavy night and years of drinking, how much recovers when you cut back, and how to check where you stand.
Yes, ongoing stress can lower testosterone. How the stress hormone cortisol suppresses testosterone in men, why constant stress matters more than a bad day, and how to check where you stand.
Sleep, caffeine timing, training load, blood sugar, breathing, ashwagandha and magnesium — the evidence-based ways to lower high cortisol, and the 'adrenal reset' fads that don't. Plus why testing cortisol with DHEA-S beats guessing.
The common signs of high cortisol, from belly weight and broken sleep to feeling wired but tired. What raises it, when it needs a doctor, and how a morning blood test tells you where you stand.
The same blood, drawn on a different day, tells a different story. Day 2-5 testing for FSH and LH explained, plus the rules for irregular cycles, perimenopause, after menopause, contraception and retesting.
Sex hormone-binding globulin decides how much testosterone you can actually use. High vs low SHBG, the link to insulin resistance and PCOS, UK reference ranges, and the free androgen index explained.
The free androgen index estimates how much of your testosterone is active. UK reference ranges, why FAI rises in PCOS, the SHBG trap, FAI vs free testosterone, and how to test it properly.
LH and FSH are the pituitary's instructions to the ovaries and testes. What high and low levels mean, how the pattern separates a gonad problem from a pituitary one, the FSH rise in menopause, the LH to FSH ratio in PCOS, and UK reference ranges.
Prolactin is the pituitary hormone that can quietly switch off testosterone. High vs low levels, causes from prolactinoma to medication, how to test for an accurate result, and UK reference ranges.
Oestradiol (E2) is not just a women's hormone. Why men need it, what high levels from aromatisation and TRT do, the symptoms of high and low, how to test accurately, and UK reference ranges.
DHEA-S is the most abundant hormone in your blood and the adrenal gland's output alongside cortisol. What high and low levels mean, the cortisol to DHEA-S ratio, age-specific reference ranges, and how to test accurately.
The best time to test testosterone is 7am-11am, fasted. Why time of day shifts the result by up to a quarter, why one low reading is never enough, and a simple pre-test checklist for an accurate number.
Why a normal total testosterone result can still mean low testosterone. Free T levels in nmol/L, the BSSM 0.225 threshold, SHBG explained, calculated vs measured free T, and the four result patterns that matter.
Normal total testosterone but still symptomatic? The cause is often high SHBG locking it away. What raises SHBG, what genuinely lowers it, the insulin paradox, and how to measure free testosterone properly.
Total testosterone, free testosterone, SHBG, LH, FSH and prolactin — what a full panel includes, NHS vs optimal ranges, 6 result patterns, evidence-based ways to raise testosterone naturally, and when to consider TRT.
When an NHS GP will test testosterone, what the test includes and leaves out, why requests get declined, how to ask, and when private testing makes sense.
Morning cortisol, diurnal rhythm, the cortisol:DHEA-S ratio explained in plain English. NHS vs optimal ranges, overtraining, burnout, and when to see your GP.
Tired but wired at bedtime, then wide awake at 3am? How cortisol's daily rhythm shapes your sleep, what a blood test can and cannot show, and the fixable causes worth checking first.
Why progesterone confirms ovulation, what the day-21 luteal test really means, how to time it on any cycle length, and how progesterone fits fertility, perimenopause and HRT.
Testosterone, oestrogen, thyroid, cortisol, DHEA-S — what each marker means, NHS vs optimal ranges, symptoms of imbalance, and when to see your GP.
Black seed oil is the supplement of 2026, with claims it lowers LDL, triglycerides and blood pressure. What the trials really found, where the evidence is weaker than the hype, and the markers that show whether it is working for you.
The 2026 seed-oil debate, answered with evidence. What they do to LDL and inflammation, where the worry has a grain of truth, and the four heart markers that show your own response.
The 2026 fibermaxxing trend, answered with evidence. What psyllium husk does to LDL and non-HDL cholesterol, how much to take, and the blood markers that show whether it is actually working for you.
The NHS says 30g of fibre a day, but most UK adults get closer to 20g. How much you need, why soluble fibre lowers cholesterol, and the blood markers that show whether closing the gap moved your numbers.
TSH, FT4, FT3, ferritin, FBC, magnesium, vitamin D, HbA1c, hs-CRP, potassium — the 10 biomarkers behind palpitations with a normal ECG. NICE CKS pathway, NHS vs optimal ranges, 5 result patterns, 7 FAQs.
ApoB, Lp(a), hs-CRP, HbA1c and a full lipid panel — the blood tests that actually predict heart disease.
Apolipoprotein B is the single best blood marker for cardiovascular risk. Learn what ApoB measures, why standard cholesterol tests miss it, and what your levels mean.
What a triglycerides blood test measures, normal vs high levels in mmol/L, why fasting changes the result, and evidence-based ways to lower raised triglycerides.
The evidence-based ways to lower high triglycerides, whether omega-3 supplements really help, what UK cardiology bodies say, and the blood markers that show if it is working.
The evidence-based ways to lower high cholesterol, whether supplements really help, what the NHS says about diet, and the blood markers that show if it is working.
Total cholesterol, LDL, HDL, triglycerides, ApoB and Lp(a) explained. NHS reference ranges vs optimal targets, the TC:HDL ratio, and when a standard lipid panel isn't enough.
Healthy cholesterol levels in mmol/L, why the NHS targets are the same at every age, why women's levels rise after menopause, the TC:HDL ratio and non-HDL, and when to test.
Lipoprotein(a) is 80–90% genetic, affects 1 in 5 people, and the ESC recommends testing at least once in every adult's lifetime. What Lp(a) is, what your levels mean, and what to do if yours is elevated.
The omega-3 index measures EPA and DHA in red blood cell membranes. Most UK adults sit at 4–5% — well below the 8–12% optimal zone. REDUCE-IT and VITAL trial evidence, dietary sources, supplementation guidance, and 7 FAQs.
LDL is the cholesterol that drives heart disease. See the UK optimal range in mmol/L, NHS vs optimal targets, what raises LDL, and how to lower it safely.
HDL is the protective cholesterol. See the UK optimal range in mmol/L, what counts as low HDL, whether HDL can be too high, and evidence-based ways to raise it.
Non-HDL cholesterol is the NICE-preferred number for heart risk. See how it is calculated, the UK optimal range in mmol/L, no fasting, and how to lower it.
ApoB counts the particles that cause heart disease; LDL measures the cholesterol they carry. When the two disagree, and which to trust.
Which blood tests should you get before and during GLP-1 treatment? Liver, kidney, thyroid, metabolic and nutritional biomarkers explained.
Bone loss, muscle depletion, thyroid disruption, gallbladder risk — the compounded dangers of Ozempic + perimenopause.
On Mounjaro (tirzepatide)? The blood markers worth monitoring before and during treatment: thyroid, liver, kidney, HbA1c, lipids and nutrients.
On semaglutide (Ozempic, Wegovy, Rybelsus)? The blood markers worth monitoring before and during treatment: thyroid, liver, kidney, HbA1c, lipids, nutrients.
On Wegovy for weight loss? The blood markers worth monitoring before and during treatment: thyroid, liver, kidney, HbA1c, lipids, nutrients and muscle.
The baseline blood tests worth having before you start a GLP-1: HbA1c, liver, kidney (eGFR), lipids and thyroid, and why a before-picture makes later changes easy to read.
Appetite-reducing medicines can quietly lower how many nutrients you take in. The markers worth watching on a GLP-1, and how often to check them.
1 in 6 UK adults are vitamin D deficient. Symptoms, optimal blood levels, supplementation doses, and when to get tested.
Complete guide to iron deficiency blood tests. Ferritin, serum iron, TIBC, and transferrin saturation explained — with NHS vs optimal ranges, the three stages of deficiency, and when to worry.
Ferritin is the iron-stores marker and the earliest sign of iron deficiency, often low before haemoglobin drops. UK reference ranges vs optimal, low ferritin causes, why it's read with CRP, and when to see your GP.
Serum B12, active B12, MMA and homocysteine explained in plain English. NHS vs optimal ranges, deficiency symptoms, the grey zone, and when to see your GP.
The difference between serum and red cell folate, what low folate means for anaemia and pregnancy, the homocysteine link, and why folate is always read alongside vitamin B12.
What plasma PLP measures, the symptoms of low B6, the often-missed risk of taking too much (nerve damage from high-dose supplements), and the homocysteine link.
Vitamin D, B12, folate, iron, magnesium, zinc, selenium and omega-3 — the 10 nutritional markers that explain fatigue, hair loss, brain fog, and poor immunity. NHS vs optimal ranges.
Magnesium is involved in 600+ enzymatic reactions — from ATP energy to sleep, heart rhythm and mental health. Serum vs RBC magnesium, NHS vs optimal ranges, deficiency symptoms, who should test, and which supplement forms actually work.
Zinc runs 300+ enzymes — immune defence, wound healing, taste, skin and testosterone. Why serum zinc misleads, deficiency symptoms, NHS vs optimal ranges, the zinc-copper balance, and who should test.
The 10 blood markers every vegan should track — B12, ferritin, vitamin D, omega-3 index, zinc, iodine, folate, calcium, selenium and a full blood count. EPIC-Oxford evidence, NHS vs optimal ranges, and practical supplementation advice.
12 biomarkers behind persistent fatigue — ferritin, thyroid, hormones, inflammation — NHS vs optimal ranges, 5 named fatigue patterns, red flags, and evidence-based management.
Persistent pins and needles or numbness can have checkable causes — B12 deficiency, too much B6, diabetes and thyroid problems. What each test shows, and the red flags that mean urgent help.
The blood tests for frequent muscle cramps — magnesium, calcium, potassium, sodium, vitamin D, kidney and thyroid — and the honest truth that most cramps have no single cause.
Ferritin, TSH, vitamin B12, folate, vitamin D, magnesium, HbA1c, CRP/ESR — the 10 biomarkers that reveal treatable causes of headache and migraine. NICE CG150, NHS vs optimal ranges, 5 result patterns, 7 evidence-based interventions.
ESR, hs-CRP, TSH, FT4, ferritin, FBC, vitamin D, B12, HbA1c, ANA — the 10 biomarkers that rule out treatable conditions mimicking fibromyalgia. NICE CKS, EULAR 2017, 5 result patterns, 7 evidence-based interventions.
hs-CRP, ESR, uric acid, rheumatoid factor, anti-CCP, ANA, vitamin D, ferritin, HbA1c — the 10 biomarkers that distinguish inflammatory arthritis, gout, haemochromatosis, and autoimmune disease from wear-and-tear joint pain.
Ferritin, thyroid, testosterone, vitamin D, zinc — the blood tests that explain hair thinning, optimal ranges for hair health, when to see your GP, and evidence-based next steps.
Beyond 'your bloods are normal' — the 10 blood tests that distinguish ME/CFS from treatable conditions. Thyroid, ferritin, vitamin D, cortisol, hs-CRP, HbA1c, B12, FBC, coeliac screen, and ANA. NICE NG206 investigations, 5 result patterns, 6 treatable mimics, and 7 FAQs.
Night sweats affect 1 in 3 adults — but the NHS rarely tests beyond basic bloods. Thyroid, hormones, HbA1c, cortisol, ferritin, vitamin D, magnesium, hs-CRP: the 10 biomarkers behind nocturnal sweating, 5 result patterns, and when to worry.
Treatment pathway or test catalogue? Prices, hormone panels and what happens after the report, compared honestly, with a third option for men who want a plan without a prescription.
US-only for now, despite a Companies House registration. What Function offers, why the UK market differs, and the honest UK alternatives.
Prices, panels, sample methods, results speed and subscriptions compared, with honest verdicts by use case and the question both leave unanswered.
An honest comparison of private home blood tests and NHS GP blood tests — cost, speed, what gets tested, and when each makes sense.
What the NHS tests, what it doesn't, and when paying for private blood work is genuinely worth it. An honest comparison for UK adults.
An evidence-based comparison of private blood tests in the UK. Test tiers, costs, turnaround times, the 10 most important biomarkers, and how to choose the right panel.
An honest UK roundup of home finger-prick providers, Medichecks, Thriva, Forth, Numan and Helvy, compared on price, markers, accreditation and report quality.
The common signs of low magnesium, from muscle cramps and 3am waking to low mood and a racing heart. Why these symptoms overlap with stress and other things, and the simple blood test that tells you if you are actually low.
Magnesium is 2026's headline calm supplement, but the evidence is strongest in people who are actually low. What the reviews show, which form to pick, and the two markers, magnesium and cortisol, worth checking on a blood test before you start.
Glycinate, citrate, threonate, oxide: the seven forms of magnesium compared honestly, what each is actually best for, and why a blood test tells you if any of them will help before you spend.
A run of fresh 2026 trials put creatine to work on menopause brain fog, mood and energy. What that research actually found, why it is early, and the fixable blood markers worth checking before you credit or blame a supplement.
Creatine is the supplement of the moment for women over 50 — for muscle, strength and sleep. What the 2025 evidence actually shows, why the strongest trial found no bone-density benefit, the right dose, and the baseline blood markers worth checking before you start.
Randomised trials show ashwagandha lowers morning cortisol in stressed adults and modestly raises testosterone in some men. The honest evidence, the safety caveats the listicles skip, and the markers to measure before and after a trial.
Ashwagandha does lower cortisol, but a 2026 case report links high doses over a year to cortisol falling too low. The signs of low cortisol, who is most at risk, and how a blood test shows your real level.
Lion's mane is 2026's headline focus mushroom, but brain fog is often a fixable deficiency, not a missing supplement. What the small trials found, and the three things, B12, vitamin D and thyroid, a blood test checks before you spend on a nootropic.
A large 2026 umbrella review says collagen helps skin and joints, but does nothing for sports recovery. What the evidence shows, where the marketing runs ahead of it, and the markers worth checking before a £30-a-month habit.
Astaxanthin is the antioxidant supplement of 2026. The strongest trials show it can lower triglycerides and raise HDL; the inflammation evidence is far weaker. The honest read, and the three blood markers to measure before and after a trial.
Does Tongkat Ali raise testosterone? A 2022 meta-analysis says yes on average, but mostly in men who are already low. The honest evidence, the caveats the listicles skip, and the four markers to measure before and after a trial.
Glycinate vs citrate for sleep, compared honestly — absorption, the laxative catch, what the evidence really shows, and why measuring your magnesium beats guessing the form.
Most people waste money on supplements they don't need. Blood testing shows exactly what's low — and what's not worth the capsule.
What the randomised-trial evidence really shows about berberine, fasting glucose and HbA1c, the cautions, and the marker that tells you if it is working.
TSH blood test explained for the UK: the 0.4–4.0 mU/L reference range, what high and low TSH can suggest, optimal vs normal, and why free T4 matters too.
TSH, Free T4, Free T3 and thyroid antibodies explained. NHS reference ranges vs optimal levels, symptoms of thyroid dysfunction, and when to get tested.
What's a normal TSH, free T4 and free T3 in the UK? Reference ranges, why the TSH range rises with age, the subclinical grey zone, pregnancy ranges, and when to test.
What TPO antibodies (anti-TPO) and thyroglobulin antibodies (anti-TG) measure, what raised levels can mean, why they often rise before TSH shifts, and how a clinician reads them alongside TSH and free T4.
Excess facial hair, acne and irregular periods are the usual signs of high testosterone in women, and PCOS is the commonest cause. The symptoms, what a blood test measures, and the female ranges that matter.
The complete guide to blood tests for women. Hormones, thyroid, iron, vitamin D, bone health, fertility, PCOS, and perimenopause — what to test at every age.
FSH, oestradiol, LH, AMH, thyroid — NICE NG23 guidelines explained, NHS vs private testing, HRT monitoring, perimenopause diagnosis, and what your results actually mean.
Do you need a blood test before HRT? Baseline checks, oestradiol monitoring on patches and gel, testosterone before and during, thyroid overlap, and British Menopause Society targets.
Under 45 with menopausal symptoms? The blood tests used for early menopause and premature ovarian insufficiency: FSH, oestradiol, AMH, the markers that rule out mimics, and what a diagnosis changes.
Women make testosterone too. Total testosterone, SHBG and the free androgen index, female ranges, when a low level is worth investigating, and the PCOS picture of high testosterone.
Why FSH alone can’t diagnose perimenopause, the 10 biomarkers that actually help (thyroid, ferritin, AMH, vitamin D, testosterone), NHS vs optimal ranges, NICE NG23 guidelines, and when to test.
What counts as an irregular period, the hormones worth checking (FSH, LH, SHBG, testosterone), the PCOS and thyroid link, and when to see a GP.
Testosterone, SHBG, LH:FSH ratio, fasting insulin, DHEA-S, AMH — Rotterdam criteria, NHS diagnostic gaps, four phenotypes, and what your results actually mean.
Which blood markers are worth tracking on HRT, what a baseline gives you, and how to read your numbers as your regimen settles.
Weight, fatigue, hair and cycle changes overlap between PCOS and thyroid conditions. The markers that tell them apart, and how to test.
What the AMH test really measures, how it changes with age, what it means for fertility and IVF, the link to early menopause and PCOS, and what AMH cannot predict.
AMH, FSH, LH, oestradiol, progesterone, thyroid, prolactin, testosterone — fertility hormone testing explained for UK couples. NHS pathway gaps, optimal timing, and how to interpret your results.
p-tau217, the NHS ADAPT trial, and six biomarkers you can check today that are linked to brain health. Evidence-based UK guide.
Thyroid, ferritin, B12, vitamin D, HbA1c, folate, hs-CRP, testosterone and iron studies — the 9 biomarkers that reveal the physical causes of brain fog. NHS vs optimal ranges for cognition, 5 result patterns, and evidence-based interventions.
Fasting glucose blood test explained for the UK: normal levels below 5.5 mmol/L, the raised and diabetes ranges, and how a glucose reading differs from HbA1c.
Fasting insulin blood test explained for the UK: what the marker measures, why it can flag early insulin resistance before glucose rises, and how to prepare.
The evidence-based ways to lower HbA1c: weight, diet, movement and time. What NICE says, how fast the number can move, and how to measure your progress at home.
Only 12% of UK adults are metabolically healthy. HbA1c alone misses insulin resistance by years. This guide covers the 10 biomarkers — including fasting insulin, HOMA-IR, ApoB, and hs-CRP — that catch metabolic dysfunction before it becomes type 2 diabetes.
What ALT, AST, GGT and the AST:ALT ratio measure for fatty liver (NAFLD), why a normal ALT can still hide it, FIB-4 as context, and the link to insulin resistance and metabolic syndrome.
Insulin resistance builds for years before pre-diabetes while a standard glucose test still reads normal. The markers that catch it earlier — fasting insulin, HOMA-IR, HbA1c and the triglyceride-to-HDL ratio — and what your results mean.
What the uric acid blood test measures, normal vs high levels, the link to gout and kidney stones, why insulin resistance raises it, the foods that matter, and when to test.
HbA1c, fasting glucose, OGTT, fasting insulin and HOMA-IR — every diabetes blood test in the UK explained. NHS thresholds vs optimal ranges, prediabetes window, type 1 vs type 2, and which extra markers catch risk years earlier.
What HbA1c measures, NHS vs optimal ranges, prediabetes explained, type 2 diabetes risk factors, and evidence-based ways to lower your levels.
ALT, AST, ALP, GGT, bilirubin and albumin explained. NHS reference ranges vs optimal levels, NAFLD screening, the ALT:AST ratio, and when abnormal liver enzymes need investigation.
5.1 million people in England have pre-diabetes. HbA1c, fasting glucose, fasting insulin, HOMA-IR, triglycerides and vitamin D — the 6 markers that catch insulin resistance early. NHS thresholds vs optimal, the DPP 58% evidence, and what to do next.
ALT (alanine aminotransferase) is a liver enzyme released when liver cells are stressed. See normal UK ranges, what a raised ALT means, and when to see a GP.
GGT (gamma-GT) is a liver enzyme linked to bile flow and alcohol. See normal UK ranges, what a raised GGT means, and when to discuss it with your GP.
Creatinine, eGFR, urea, electrolytes and ACR explained. NHS reference ranges vs optimal levels, CKD staging, the diabetes–hypertension connection, and when abnormal kidney markers need investigation.
UK creatinine and eGFR ranges explained, why muscle, protein, dehydration and creatine raise creatinine without any kidney problem, and when a result is actually worth acting on.
Creatine supplements raise serum creatinine and can falsely depress eGFR, flagging healthy kidneys as 'impaired'. Why it happens, what the evidence says about kidney safety, and how to read a high result before you panic.
A high-protein diet or whey shake raises your blood urea and can nudge creatinine up, making kidney markers look 'off' when your kidneys are fine. What protein really does to your results, the evidence on kidney safety, and how to get a clean reading.
How cystatin C estimates kidney function without being thrown off by muscle mass, who it helps most, the longevity angle, and how it compares with creatinine.
hs-CRP vs CRP vs ESR, cardiovascular risk stratification, chronic low-grade inflammation, NHS vs optimal ranges, and evidence-based ways to lower inflammatory markers.
CRP is the primary inflammation marker. hs-CRP detects the chronic low-grade inflammation linked to cardiovascular risk. CRP vs hs-CRP, the AHA/CDC risk strata, why it must be read in context, when to test, and when to see your GP.
White blood cell differential, immunoglobulins, lymphocyte subsets, neutrophil-to-lymphocyte ratio, vitamin D and zinc — the blood markers that reveal how well your immune system is actually working. NHS vs optimal ranges, 5 result patterns, and evidence-based interventions.
hs-CRP, ESR, FBC, thyroid, ferritin, B12, vitamin D, liver function, kidney function, and HbA1c — the screening markers that flag autoimmune conditions before antibody testing. 5 result patterns, 8 common conditions, NICE referral criteria, and 7 FAQs.
Thyroid, insulin resistance, cortisol, vitamins and hormones — the 12 biomarkers that explain why weight loss stalls and how to break through. With GP comparison table.
Complete UK guide to blood tests for unexplained weight gain. Thyroid, insulin resistance, cortisol, testosterone, oestrogen, SHBG, vitamin D, inflammation — NHS vs optimal ranges, 5 result patterns, evidence-based next steps.
Ferritin, thyroid TSH, vitamin D, magnesium, cortisol, testosterone, B12 and iron — the 8 biomarkers linked to insomnia, night waking and poor sleep quality. NHS ranges vs optimal, 5 result patterns, and evidence-based interventions.
Why low ferritin is the leading checkable cause of restless legs (with a higher-than-usual target of around 75 µg/L), plus kidney, thyroid and B12 — the other contributors worth ruling out.
A blood test does not diagnose depression, but it can rule out treatable physical contributors to low mood — thyroid, vitamin D, B12, folate, iron and hormones. What each shows, and why a test is never a substitute for support.
A blood test cannot diagnose anxiety, but an overactive thyroid, blood sugar swings, low B12, iron or magnesium and hormone shifts can mimic it. What each shows, and why a test is never a substitute for support.
Your total testosterone came back 8 to 12 nmol/L and your GP said normal, but you don't feel it. What the BSSM grey zone means, why one number proves little, and the three steps that turn a borderline result into a clear answer.
Age-specific PSA thresholds, free PSA ratio, PSA velocity, ethnic risk factors, the MRI-first pathway after a raised result, and how to get tested — NHS vs private. 7 FAQs, NICE NG131/NG12, PROMIS & PRECISION trial evidence.
TRT suppresses LH and FSH and switches off sperm production, and many men become azoospermic within months. How fast it happens, whether it reverses, fertility-sparing alternatives, and the hormones to test before you start.
Complete UK guide to blood tests for TRT monitoring. Haematocrit, PSA, oestradiol, lipids, liver function — BSSM 2022 guidelines, NHS vs private gaps, 5 result patterns, red-flag thresholds.
CRP, coeliac screen, iron studies, B12, folate, liver function, FBC, vitamin D and thyroid — 11 blood markers that reveal gut problems. NHS vs private comparison, when you need stool tests, and 7 FAQs.
Persistent bloating affects up to 30% of adults — yet the NHS typically tests just 2 of the 10 relevant markers. Coeliac screen, thyroid, ferritin, B12, folate, vitamin D, hs-CRP, liver function, FBC: what each reveals, 5 result patterns, and evidence-based next steps.
IBS affects 10–20% of UK adults — but it’s a diagnosis of exclusion. 10 biomarkers for IBS investigation (tTG-IgA, hs-CRP, FBC, ferritin, TSH, FT4, vitamin D, B12, folate, HbA1c), NICE NG61 pathway, 5 result patterns, IBS vs IBD differentiation, and evidence-based next steps.
1 in 100 UK adults have coeliac disease — 64% undiagnosed, 13-year average delay. Full NICE NG20 pathway (tTG-IgA + total IgA + EMA + IgG alternatives), the IgA deficiency trap, 6 downstream deficiency markers, 5 result patterns, gluten challenge rules, and evidence-based next steps.
England won 3-2 at the Estadio Azteca, roughly 2,240m up where the air holds less oxygen. The altitude prep behind the result, what thin air does to your blood and red cells, and the everyday markers behind energy and recovery.
England face Norway in the World Cup 2026 quarter-final at Hard Rock Stadium, Miami, on Saturday 11 July. This time the sports-science story is not altitude but sea-level heat and humidity, what it does to your fluid, electrolytes and stamina, and the everyday markers behind energy, muscle function and recovery.
Can high cortisol cause belly fat? What the stress hormone really does to weight and appetite, why 'cortisol belly' is rarely the whole story, the other causes worth ruling out, and how a morning cortisol test tells you if stress is genuinely the problem.
Cortisol alone doesn't tell the full story. This guide covers the 8 biomarkers — cortisol, DHEA-S, TSH, magnesium, hs-CRP, testosterone, HbA1c, and vitamin D — that reveal whether chronic stress is damaging your hormones, metabolism, and recovery.
“The best time to understand your health was ten years ago. The second best time is your next blood test.”
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