Kidney markers
High Creatinine Levels: What a Raised Result Actually Means
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed September 20266 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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Creatinine is waste from normal muscle activity, cleared by your kidneys. Most UK labs flag a man above roughly 104 micromol/L and a woman above roughly 90. A single raised figure is common and often has an everyday cause: muscle mass, a steak, a creatine supplement or not drinking enough. The number that matters more sits beside it, and it is eGFR.
Not sure which markers you need? Build your test →There is a little H beside your creatinine. You looked it up, found the word kidney, and stopped reading. That is the moment most people arrive here.
Here is the part the search results bury. Creatinine is a muscle waste product, so how much of it you make depends on how much muscle you carry and what you ate. It is a rough marker, and it is read alongside better ones.
1. What counts as a high creatinine in the UK?
UK reports print creatinine in micromol per litre. Ranges differ between labs, so always read the one on your own report. Typical UK adult ranges look like this.
| Group | Typical range | Flagged above |
|---|---|---|
| Men | 64 to 104 micromol/L | about 104 |
| Women | 49 to 90 micromol/L | about 90 |
Men sit higher because they carry more muscle on average. That is the whole reason for the split. Our creatinine by age guide covers how the figures shift across the decades, and a result below the range is usually the same muscle story running the other way.
2. Find your own number
Most people arrive holding one value. Here it is read line by line. The right-hand column describes the figure. It does not diagnose anything.
| Your result | Men | Women | What it describes |
|---|---|---|---|
| 85 micromol/L | Inside | Inside | Mid range for both. |
| 92 micromol/L | Inside | Above | Common in a muscular woman. |
| 98 micromol/L | Inside | Above | Still inside the male range. |
| 106 micromol/L | Above | Above | Just over. Worth a repeat. |
| 115 micromol/L | Above | Above | Mildly raised. Check eGFR beside it. |
| 130 micromol/L | Above | Above | Clearly raised. GP conversation. |
| 160 micromol/L | Above | Above | Raised. Needs a GP, not a chart. |
Notice how much of the table turns on which column you are in. A bodybuilder and a small, older woman can both be normal at figures forty apart. If a hard training block is the reason, a high creatine kinase usually shows up beside it.
3. The four everyday things that raise creatinine
None of these is kidney damage. All of them are common.
- Muscle. More muscle makes more creatinine. A lifter can sit above the range with perfect kidneys.
- Meat before the test. Cooked meat carries creatinine straight into your blood. UK guidance is blunt about this one, and the quote is below.
- Creatine supplements. Creatine breaks down into creatinine, so the figure rises without kidney function changing. Our guide on whether creatine raises creatinine covers what to do before testing.
- Dehydration. Less water in the blood concentrates everything in it. See dehydration and blood test results, and U&E results explained for why a raised urea beside a normal creatinine usually points at fluid. Our guide to high urea levels covers that half of the pair.
On the meat point, the UK Kidney Association, reflecting NICE guideline NG203, is direct: “Adults should be advised not to eat any meat in the 12 hours before having a blood test for eGFR, as this can affect serum creatinine concentration.”
One more worth knowing. Some medicines, trimethoprim among them, raise measured creatinine by blocking the route it leaves the body, while kidney filtering carries on unchanged. Tell your GP what you take.
4. Why eGFR matters more than creatinine
Every UK lab calculates eGFR from your creatinine and reports it alongside. eGFR is estimated glomerular filtration rate, which means the rate your kidneys are filtering blood. It already adjusts for your age and sex.
So if your creatinine is flagged but your eGFR is 90 or more, your body is doing the work. That pairing is the single most useful thing on the report. Our eGFR by age guide reads the figures band by band.
One caveat runs the other way. Because eGFR is built from creatinine, big muscle mass can drag the estimate down in someone perfectly healthy. The kidney function test guide covers the rest of the panel.
5. When a raised creatinine does need a GP
Book an appointment, without panic, if any of these apply.
- Your eGFR is below 60 as well as creatinine being raised.
- The figure has climbed across two or more tests.
- You also have protein or blood showing in a urine test.
- You have diabetes, high blood pressure or take regular anti-inflammatories.
- You are passing much less urine, or your ankles are swelling.
NICE asks for a repeat within 14 days when a raised creatinine turns up for the first time and there is nothing earlier to compare against. One reading establishes very little on its own.
Long-standing kidney trouble can also show up as a low haemoglobin, which is why a full blood count often gets requested at the same time.
6. Which blood test measures creatinine?
Helvy’s Thyroid & Vital Organs panel (£159) reports creatinine with eGFR and urea, plus thyroid, liver and cholesterol markers. Having eGFR beside the creatinine is the point, because one without the other leaves you guessing.
The General Energy & Wellness panel (£149) reports creatinine and urea alongside thyroid, cortisol, vitamin D, B12 and cholesterol. Both are home finger-prick tests, processed by UKAS-accredited UK labs.
Neither replaces a GP review of a flagged result. Not sure which fits? The build-my-test tool walks you through it, and the energy and fatigue hub covers the other causes worth ruling out.
READY TO TEST?
See your creatinine with the number that explains it
Helvy’s home blood tests report creatinine with eGFR and urea, each explained in words you already use, so a flagged line never sits there on its own. Samples are processed by UKAS-accredited UK labs.
Frequently asked questions
What is a dangerously high creatinine level?
There is no single figure, and a chart cannot set one. What matters is your eGFR beside it, whether the number is climbing across tests, and your symptoms. Any clearly raised creatinine belongs in a GP conversation rather than a comparison table.
Can dehydration cause high creatinine?
Yes. Less water in the blood concentrates what is dissolved in it, so creatinine reads higher. It is one of the most common reasons a one-off result comes back flagged. Drink normally in the days before a repeat test.
Does creatine make your creatinine high?
It can. Creatine breaks down into creatinine, so supplementing raises the measured figure without kidney filtering changing. Tell whoever reads your result that you take it, and consider a gap before testing.
Should I stop eating meat before a creatinine test?
UK guidance says adults should not eat any meat in the 12 hours before a blood test for eGFR, because it affects serum creatinine. If your test is in the morning, that mostly means skipping meat the evening before.
Is high creatinine always a kidney problem?
No. Muscle mass, meat, creatine supplements, dehydration and some medicines all raise it with healthy kidneys. That is why eGFR is calculated and reported alongside, and why one reading is rarely acted on by itself.
How quickly should a raised creatinine be rechecked?
NICE asks for a repeat within 14 days when a raised creatinine is a new finding and there is no earlier result to compare against. Your GP decides the timing based on the figure and your history.
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