Liver and protein markers
Albumin Levels by Age: Is a Low-Normal Result Just Ageing?
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed September 20268 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
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UK labs use one albumin range for every adult: roughly 35 to 50 g/L. Albumin does drift down with age, so a 36 at 78 is far more ordinary than a 36 at 30. The range does not move, which is why context matters more here than the number alone.
Not sure which markers you need? Build your test →Your albumin comes back at 36. The range beside it starts at 35. So you are inside it, technically, by one point. Nobody has rung. And you cannot tell whether that is fine, or the start of something.
The honest answer depends heavily on your age, and almost no lab report tells you that. This guide covers what albumin is, how much it really shifts across the decades, and when a low-normal result is worth a second look.
1. What is a normal albumin level in the UK?
Most UK labs print 35 to 50 g/L for adults. Albumin is a protein made by your liver. It is the most abundant protein in your blood, and it does two main jobs. It carries things around, and it holds fluid inside your blood vessels.
On the NHS App it often reads like this: serum albumin level 42 g/L [35.0 - 50.0]. Serum just means the liquid part of your blood. The figures in brackets are the range your lab uses.
Albumin drifts down with the decades. The urea printed a few lines below it does the opposite, and urea levels by age shows how far.
| Your albumin | What it usually means |
|---|---|
| Above 50 g/L | High. Most often you were a little dehydrated on the day. |
| 45 to 50 g/L | Upper half of the range. Normal. A dry sample nudges you here. |
| 41 to 44 g/L | Middle of the range. A typical adult result at any age. |
| 39 to 40 g/L | Normal. Close to the average for adults in their late eighties. |
| 36 to 38 g/L | Low end of normal. Ordinary past 70. Younger, read it beside CRP. |
| 35 g/L | The floor most UK labs print. Inside the range, only just. |
| Below 35 g/L | Low. Worth a repeat, with liver, kidney and CRP results beside it. Our guide to low albumin levels covers what pulls it down, and a result over 50 g/L is usually fluid rather than protein. |
Leeds Teaching Hospitals NHS Trust describes it in its pathology handbook:
“Albumin is a carbohydrate free protein which constitutes 55 to 65% of total plasma protein.”
Leeds Teaching Hospitals NHS Trust, pathology test handbook
That is why albumin turns up on so many panels. It is over half your blood protein, so it moves whenever something bigger is going on. The same trust notes it is measured as part of liver and bone profiles. It is rarely the marker anyone ordered on purpose. The enzymes it sits beside behave the same way, and ALT and AST levels by age reads those two.
Is a 4.1 the same as a 41? Reading g/dL against g/L
Yes. UK labs report albumin in g/L. American labs, and some private panels and apps, use g/dL. The UK Kidney Association puts the factor at 0.1, so you are only moving the decimal point. A 41 g/L is a 4.1 g/dL. Nothing else changes.
| UK albumin, g/L | US albumin, g/dL | How a UK lab labels it |
|---|---|---|
| 33 | 3.3 | Below the range |
| 35 | 3.5 | Bottom of the range |
| 38 | 3.8 | Low-normal |
| 41 | 4.1 | Mid-range |
| 45 | 4.5 | Upper half of the range |
| 50 | 5.0 | Top of the range |
So the UK band this guide is built around, 35 to 50 g/L, reads as 3.5 to 5.0 g/dL. Albumin is kind that way. Most markers need real arithmetic between the two systems, and urea is a good example: a normal urea of 7.8 mmol/L is a BUN of 21.8 mg/dL, which looks nothing like it.
2. Does albumin fall with age?
Yes, gently, and the evidence for it is consistent. Yet UK labs report every adult against the same band. Your age changes nothing about how the result is printed.
A study of 17,930 adults in the Moli-sani cohort put it this way. Low albumin “was more frequent in individuals aged 65 years or older, reinforcing previous reports showing an inverse association between serum albumin and elderly population”. That study used 35 g/L or below as its cut-off.
So the drift is real, and it is small. It is a nudge over decades, not a step change at retirement. That matters both ways. It explains a low-normal result in an older adult, and it does not excuse one that keeps falling.
3. Normal albumin levels by age: what the data shows
There is no official UK albumin chart by age. Your lab prints 35 to 50 g/L whether you are 25 or 85. What exists is research on what people that age actually measure.
The clearest numbers come from 4,115 people aged 71 and over, tested at home across three communities and reported in the Journal of Clinical Epidemiology.
| Age | Men | Women |
|---|---|---|
| 71 to 74 | 41.6 g/L | 41.1 g/L |
| 90 and over | 38.5 g/L | 38.9 g/L |
Read those as a description of a population, not a target for you. Across twenty years of late life the average moves under 3 g/L. The same study put the effect at 0.8 g/L for every ten years of age once health status was taken into account.
One figure from it deserves more attention than it gets. A result below 35 g/L turned up in just 3.1% of those adults, every one of them over 70. Low albumin stays uncommon in old age. That is the line the age charts leave out.
UK researchers have argued the printed range should move with age. They analysed 1,079,193 albumin results sent to primary care across England:
“Reference intervals for serum albumin should be stratified by age and sex.”
Weaving, Batstone and Jones, Annals of Clinical Biochemistry, 2016
That is not how UK labs report today. The same paper found the gap between laboratories was wide enough to matter in the clinic. So a chart you found elsewhere is a rough guide. The range printed beside your own result is the one that counts.
4. What does a low albumin point to?
Four broad directions, and a clinician narrows them using what sits beside it. Albumin is a signal that something is worth looking at. It is not an answer on its own.
- Inflammation. The liver makes less albumin while the body is fighting something, so CRP is usually checked with it, and a raised CRP is often the whole explanation.
- Losing it. Kidneys can leak protein into urine, and the gut can lose it too.
- Making less of it. Liver problems reduce output, which is why albumin sits on liver panels.
- Nutrition. Sustained low protein intake shows up here, though it is a late sign rather than an early one.
A mildly low albumin after a recent illness is common and usually settles. A result that stays low, or one paired with swollen ankles or frothy urine, needs a GP appointment rather than a search engine. The full liver function panel explains how these markers are read together.
5. What does a high albumin mean?
Usually that you were dehydrated when the blood was taken. There is less water in the sample, so everything in it reads more concentrated. Albumin is simply the marker that shows it clearly.
A tourniquet left on too long does the same thing. So can a blood test straight after hard exercise. If your albumin came back high and you had skipped fluids that morning, drink normally and retest.
6. Why albumin quietly changes your other results
This is the part most people never hear, and it is the real reason albumin earns its place on a panel. Albumin carries other things in your blood, so its level changes how those things are reported.
Calcium is the clearest example. Much of your calcium travels stuck to albumin, so labs report an adjusted calcium that corrects for your albumin level. Low albumin makes raw calcium look low when the active amount is fine.
The same logic runs through hormone testing. Albumin and SHBG both bind testosterone, which is why albumin is measured when free testosterone is calculated. Change the carrier and you change the free fraction, even when total testosterone has not moved.
7. Which blood test includes albumin?
Any standard NHS liver panel includes it. Privately, look for a panel that carries the markers around it, because albumin on its own tells you very little.
Helvy measures albumin in three tests. Thyroid & Vital Organs pairs it with total protein, ALT, ALP, urea, creatinine and eGFR. General Energy & Wellness reads it alongside CRP, vitamin D and B12. Complete Male Hormones includes it because the free testosterone calculation needs it. All are home finger-prick kits, processed by UKAS-accredited UK labs.
If you are unsure which fits, the build-my-test tool walks you through it in about a minute. For a wider look at what a general panel covers, start with the full blood count guide.
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See your albumin next to the markers that explain it
Helvy's home blood tests report albumin with plain-English context, so a borderline number never sparks a needless panic. Samples are processed by UKAS-accredited UK labs.
Frequently asked questions
What is a normal albumin level by age in the UK?
UK labs use one adult band, roughly 35 to 50 g/L, at every age. In research on 4,115 adults over 70, the average ran 41.6 g/L for men aged 71 to 74 and 38.5 g/L for men aged 90 and over. Women sat close behind, at 41.1 and 38.9. Those are population figures, not reference ranges.
What is a normal albumin level over 70?
The same 35 to 50 g/L band your lab prints at any age. The average sits near 41 g/L in the early seventies and near 39 g/L past 90. A result below 35 was found in only 3.1% of adults over 70, so age alone does not explain a low one.
Is an albumin of 39 normal?
Yes. A serum albumin of 39 g/L sits inside the 35 to 50 range, in its lower half. It is about the average for someone in their late eighties, and unremarkable at any adult age unless it is falling test on test.
Is an albumin of 36 low?
It sits at the bottom of the usual range rather than below it. At 75 that is fairly ordinary. At 30 it is worth reading beside CRP and your liver and kidney markers. Either way, one reading is a prompt to look again, not a verdict.
Is an albumin of 41 or 42 normal?
Yes. A serum albumin of 41 or 42 g/L sits in the middle of the 35 to 50 range. That is a typical result for an adult at any age, and it needs no follow-up on its own.
Does albumin drop as you get older?
On average, yes, but only slightly. The Moli-sani study of 17,930 adults found low albumin was more common in people aged 65 and over. The shift is a nudge across decades, so a sharp fall is never explained by age alone.
What causes low albumin?
Four broad routes: inflammation, losing protein through the kidneys or gut, the liver making less, and sustained low protein intake. A clinician tells them apart using CRP, liver markers and a urine test.
Can dehydration raise your albumin?
Yes, and it is the usual reason. Less water in the sample makes everything read more concentrated. If you skipped fluids before the test, drink normally and repeat it.
Why is albumin measured with calcium?
Much of your calcium travels bound to albumin. Labs use your albumin to report an adjusted calcium, because a low albumin makes raw calcium look low when the active amount is fine.
Related guides
Albumin Blood Test UK
What the test measures and why it is ordered.
Total Protein Blood Test UK
The number albumin makes up more than half of.
ALP Levels by Age
The other liver marker where age changes everything.
Blood Test Reference Ranges UK
Why 'normal' on a lab report is a population range, not a target.
Related panels
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