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An inflammatory markers blood test measures the chemicals your body releases when something is irritating it. The two that matter for most active men are hs-CRP and ferritin. If your recovery has slowed and sleep and diet haven't changed, the test tells you whether there's a measurable signal behind what you're feeling; and gives you a baseline you can actually retest against.
What "inflammatory markers" actually means (without the textbook)
You probably didn't come here for a biology lesson. You ended up here because something in your body has changed.
The session you'd shake off in a day now takes three. The post-gym ache lingers. Sleep is the same, diet is roughly the same; but the body isn't.
That's the situation a lot of men in their late 30s and 40s land in. Everything looks normal on paper. The mirror says fine. The training log says fine. But the recovery has gone somewhere.
Every one of them got the same question from me.
What did your GP actually test?
The honest answer was usually: not this.
Inflammation is your immune system's response to irritation. In short bursts it's useful: it heals cuts, fights off colds, helps muscle adapt to training. The problem is when it doesn't switch off. Low-grade inflammation that sits in the background for weeks drains energy, recovery and mood in men who otherwise look healthy on paper (NHS, Blood tests overview).
Blood doesn't measure how you feel. It measures the chemicals your body releases when it's responding to something. An inflammatory markers blood test picks those up.
The point of testing isn't to confirm you're struggling. You already know that. It's to find out whether there's a measurable signal underneath it.
The four markers a UK men's blood test would measure
Four markers worth knowing. Two you actually want measured. Two for context, so when a hospital report comes back you know what you're reading.
At a glance, the inflammatory markers on a UK panel and what a healthy reading looks like:
| Marker | What it is | What you want to see |
|---|---|---|
| hs-CRP | High-sensitivity C-reactive protein, the headline marker | Under 1.0 mg/L (1.0 to 3.0 average; over 3.0 elevated) |
| Ferritin | Iron store protein that also rises with inflammation | Above 30 µg/L, and not abnormally high |
| ESR | Older, slower inflammation test still on NHS panels | Context only; hs-CRP is the more useful number |
| IL-6 / fibrinogen | Research-grade, rarely on consumer panels | Not needed for a standard UK panel |
hs-CRP: the headline one
hs-CRP stands for high-sensitivity C-reactive protein. It's a protein your liver releases when your immune system is busy.
The "high-sensitivity" part matters. Standard CRP picks up obvious infection: flu, abscess, something acute. hs-CRP picks up the low-grade readings that sit underneath active recovery and long-term cardiovascular risk in otherwise healthy men. Different tool, different question (British Heart Foundation, Inflammation: what is it, and how does it affect the heart?).
For an active man tracking how he feels, hs-CRP is the one to ask for.
hs-CRP is the marker this whole guide keeps coming back to. For the full breakdown, the NHS cutoff versus the hs-CRP bands, what each reading means, and the acute things that make a single number lie, our CRP blood test guide goes deeper.
Ferritin: inflammation in disguise
Ferritin is the protein your body uses to store iron. That's its main job.
It has a second job. It rises sharply when there's inflammation around. Doctors call it an acute-phase reactant. The plain version: this number jumps when the immune system is working.
That second job is what makes ferritin confusing. A man with high ferritin and low iron stores looks contradictory on a basic test. The iron's genuinely low. The ferritin's being pushed up by inflammation. Without the context, you'd miss it.
ESR: older, slower, less useful
ESR (erythrocyte sedimentation rate) is the original inflammation test. Still on most NHS panels because it's cheap. Slower to change than hs-CRP. Less precise for the low-grade picture an active man is trying to read. If your GP test came back with an ESR result, that's normal. hs-CRP is the more useful number.
IL-6 and fibrinogen: research-grade, rarely consumer-tested
IL-6 and fibrinogen are hospital and research markers. Expensive to run. Don't add much that hs-CRP and ferritin don't already cover. Worth knowing the names exist. Not worth chasing on a UK panel.
The Andro Prime Energy & Recovery Check measures the two that matter. hs-CRP and ferritin. Alongside Vitamin D and Active B12.
What counts as "high": the UK numbers
Numbers without context are useless. Here are the thresholds UK private labs and most GPs work from.
Under 1.0 mg/L: low cardiovascular risk profile. This is where you want to sit.
1.0 to 3.0 mg/L: average. Common in the UK adult population. Not a crisis but not a clean read either.
Over 3.0 mg/L: elevated. Worth understanding why, and worth retesting in 4 to 8 weeks.
Over 10 mg/L: your GP that week. This range points to acute infection or a more significant inflammatory event, not lifestyle drift.
The AHA's three-band framework (under 1 / 1 to 3 / over 3 mg/L) is the de-facto UK standard. NHS clinical guidance references the same cutoffs (Pearson et al., 2003, AHA/CDC Scientific Statement in Circulation, Markers of inflammation and cardiovascular disease).
One reading on its own is rarely actionable. A hs-CRP taken the morning after a hard session, the week of a cold, or shortly after dental work can sit elevated for reasons that have nothing to do with your baseline.
The practical rule: don't decide off a single number. Test. Wait 4 to 8 weeks. Retest when you're not acutely ill and haven't trained brutally in the previous 48 hours. The number you've watched move is the one that means something.
Ferritin's two-direction problem
Ferritin matters at both ends, which is why it gets confusing.
Low ferritin, under 30 µg/L in adult men, means depleted iron stores. If recovery is slow, sleep is fine, and ferritin is low, that's a plausible cause. It's a GP conversation, not a supplement one. Iron has a real overdose risk. It needs to be dosed properly.
High ferritin can mean inflammation pushing the number up. Or heavy alcohol load. Or, much more rarely, genuine iron overload (haemochromatosis). It's a signal, not a verdict. Your results may show a single elevated ferritin reading that isn't actually about iron at all.
What high inflammation usually means in active men
If you're an otherwise healthy man between 35 and 50, persistently elevated hs-CRP is almost never the dramatic story. It's a slow accumulation.
Most of the time, it's one of five things. Sometimes two of them stacked.
Training load that's outrun recovery
The most common cause in men who train. Sessions get harder. Weekly volume creeps up. Deloads get skipped. The body never gets the recovery week it actually needs.
A 2020 systematic review in Frontiers in Physiology found measurably elevated baseline CRP in men running heavy training volume, with the effect largest in those at 8+ hard sessions a week without structured deloads (Cerqueira et al., 2020, Inflammatory effects of high and moderate intensity exercise).
What it looks like in practice: hs-CRP that sits at 2 to 4 mg/L across a deload week, not just after a hard session. The post-session bump is normal. The persistent elevation is the problem.
Sleep debt
Sleep isn't a soft variable.
Chronic short sleep, under 6 hours for several weeks, raises inflammatory markers by a measurable margin. Cohort studies put the effect somewhere in the order of 30 to 40%, with hs-CRP specifically affected (Irwin et al., 2016, Biological Psychiatry).
Quality matters too, not just hours. A consistently broken seven hours can sit worse than a clean six.
Body composition and visceral fat
Visceral fat is the fat that sits around the organs. Not the fat you can pinch.
It's metabolically active. It releases inflammatory signals on its own. That's why men carrying weight around the middle often run elevated hs-CRP even when the rest of the lifestyle looks reasonable.
It's also one of the most responsive levers. A 5 to 10% reduction in body weight is consistently associated with a meaningful drop in hs-CRP.
Alcohol and ultra-processed food
Both raise the noise floor.
Heavy alcohol use, more than 14 units a week (the UK guideline), drives inflammation directly. Ultra-processed food is more indirect: gut effects, blood sugar swings, the trans fats some of it still contains. The signal is real.
These are the two cheapest levers to pull. They're also the two most often dismissed.
The other half: when it isn't lifestyle
You've genuinely checked all four of those for eight weeks. The number won't come down. The answer probably isn't more discipline.
Common other causes: a dental infection (a low-grade abscess can run hs-CRP up for months without much pain). Gut issues. An undiagnosed autoimmune condition. A long-tail post-viral picture. None of these are things you fix with a better protein shake. They're things you take to a GP.
"An elevated hs-CRP in a healthy active man is almost always a signal, not a diagnosis. The question is what's signalling it; and that's what a baseline plus a retest tells you. A single number on its own is rarely actionable. A number you've watched move is."
What changes when you actually have the number
The point of testing isn't the number. It's the loop.
Without a baseline, you're guessing. You add fish oil. You cut the lunchtime beer. You sleep an extra hour for a fortnight. And you don't know whether any of it worked.
With a baseline, you change one variable. Give it 6 to 12 weeks. Retest. See what changed.
It's also yours. Your blood data is your record. If you ever do take it to a GP, for a referral, for context, for a second opinion, you have a timeline of readings, not a single snapshot. That's something the standard eight-minute appointment isn't structured to build for you.
How Andro Prime's Energy & Recovery Check measures this
The Energy & Recovery Check (Kit 2) measures hs-CRP and ferritin alongside Vitamin D and Active B12. The four markers most worth running together for an active man.
Finger-prick at home. UKAS ISO 15189-accredited lab (Vitall). 2 to 5 working days for results once the sample lands.
Your results come back through our dashboard with thresholds aligned to the framework above, written in plain English, and reviewed by our GMC-registered medical lead Dr Ewa Lindo. We don't diagnose. We give you the number, the context, and a clear next step, including the GP-referral one when that's what the result calls for. See the Kit.
Your next move
If you only read this section: hs-CRP and ferritin are the two markers worth measuring. The thresholds above are widely used across UK private labs and align with NHS clinical context. A single reading is rarely actionable; the retest is where the answer is. Anything over 10 mg/L is a GP conversation, not a wellness one.
So here's the question.
What's actually elevated, and what's just lifestyle noise? You can guess for another quarter and keep trying to fix what you haven't measured. Or you can find out where your numbers sit, change one thing, and retest in eight weeks with the real answer. Which one moves the needle?
Find out where your numbers actually sit. The Energy & Recovery Check measures hs-CRP and ferritin alongside Vitamin D and Active B12: the four markers most worth running together for active men. Finger-prick at home, UKAS-accredited lab, results in 2 to 5 working days.
When you're ready for the recovery side. Vitamin C contributes to normal collagen formation for the normal function of cartilage. Our Joint & Recovery Collagen pairs hydrolysed collagen peptides with UC-II, Vitamin C, and MSM. Launching shortly. Join the waitlist →
System DB // References
- NHS. Blood tests: overview. https://www.nhs.uk/conditions/blood-tests/
- British Heart Foundation. Inflammation: what is it, and how does it affect the heart? https://www.bhf.org.uk/informationsupport/heart-matters-magazine/research/what-is-inflammation
- Pearson, T. A. et al. (2003). Markers of Inflammation and Cardiovascular Disease: Application to Clinical and Public Health Practice. AHA/CDC Scientific Statement. Circulation 107: 499–511. https://www.ahajournals.org/doi/10.1161/01.cir.0000093381.57779.67
- Cerqueira, É. et al. (2020). Inflammatory effects of high and moderate intensity exercise: a systematic review. Frontiers in Physiology 10: 1550. https://doi.org/10.3389/fphys.2019.01550
- Irwin, M. R., Olmstead, R., Carroll, J. E. (2016). Sleep disturbance, sleep duration, and inflammation: a systematic review and meta-analysis of cohort studies and experimental sleep deprivation. Biological Psychiatry 80: 40–52. https://doi.org/10.1016/j.biopsych.2015.05.014
Frequently asked questions
What is inflammation in the body?
Inflammation is your immune system's response to irritation, injury or infection. Short bursts of it are normal and useful: that's how cuts heal and you fight off colds. The problem is when it stays switched on at a low level for weeks or months. That's the kind a blood test picks up, and the kind that quietly drains energy and recovery in otherwise healthy men.
What are inflammatory markers in a blood test?
Inflammatory markers are chemicals your body releases when it's responding to irritation. The two worth measuring on a UK private panel are hs-CRP (high-sensitivity C-reactive protein) and ferritin. Older NHS panels also include ESR. IL-6 and fibrinogen exist but are research-grade and aren't on standard consumer tests.
What's the difference between CRP and hs-CRP?
Same protein, different test sensitivity. hs-CRP picks up the lower readings that matter for recovery tracking and long-term cardiovascular risk in otherwise healthy men. Standard CRP only flags obvious infection or active disease. For the full marker explainer, UK ranges, thresholds, and what pushes a reading up, see our [CRP blood test guide](/blog/crp-blood-test).
What is a normal hs-CRP level in the UK?
Under 1.0 mg/L is low. 1.0 to 3.0 mg/L is average. Over 3.0 mg/L is elevated. That's the AHA framework UK private labs use. A single reading rarely tells the full story. See our [CRP blood test guide](/blog/crp-blood-test) for the NHS cutoff vs hs-CRP bands, acute confounders, and what to do at each threshold.
Can training cause high inflammation markers?
Yes. Hard sessions raise hs-CRP for 24 to 72 hours, sometimes longer after a marathon or heavy resistance block. If you test the morning after a brutal leg day, you'll get a noisy number. Persistently raised hs-CRP across a deload week is a different signal: that's training load that's outrun your recovery, not a normal post-session bump.
How long does it take inflammation markers to come down?
If a single reading is being driven by an acute event (a cold, a hard race, recent dental work) hs-CRP usually settles within 1 to 2 weeks. If the cause is lifestyle (training load, sleep debt, alcohol, body composition), expect 6 to 12 weeks of changes before a retest shows movement. That's why the practical retest window is 4 to 8 weeks at minimum, and we'd usually suggest 8 to 12.
Should I see my GP about high CRP?
Yes for any single reading over 10 mg/L, persistently above 3 mg/L across two retests 8 weeks apart, or any reading alongside unexplained weight loss, night sweats or persistent fever. We're built for the recovery-aware man tracking what his body is doing, not for diagnosis. The full GP-referral picture, what counts, when, and why, sits in our [CRP blood test guide](/blog/crp-blood-test).
Can supplements reduce inflammation?
Some lifestyle changes have evidence behind them: sleep, training periodisation, reducing alcohol and ultra-processed food. Vitamin C, which is in our Joint & Recovery Collagen, contributes to normal collagen formation for the normal function of cartilage (the EFSA-approved claim). Beyond that, treating inflammation is a GP conversation, not a supplement one. If you've changed the lifestyle inputs and the number won't come down, that's where the next step lives.
Can high inflammatory markers cause fatigue?
High markers do not directly 'cause' fatigue, but persistent low-grade inflammation and the tiredness active men describe often travel together. A raised hs-CRP across a deload week (not just after a hard session) is a signal that training load, sleep, body composition or alcohol may have outrun recovery. It is a prompt to look at those inputs and retest, not a diagnosis on its own.
What is the difference between inflammatory markers and infection markers, and what does a very high reading mean?
They overlap: CRP is used both to track low-grade inflammation and to flag infection. The difference is scale. Low-grade, recovery-relevant readings sit in single digits (hs-CRP under 3 mg/L is the target band). Markedly high readings, and certainly a CRP in the hundreds, point to significant infection or acute illness, not lifestyle drift. Any reading over 10 mg/L is a GP conversation; a very high reading needs prompt medical attention, not a wellness blog.