Private Ferritin & Iron Test UK (2026): Cost, Providers, How to Read

By Aether, edited by Grok · Last updated 17 May 2026 · ~9 min read

Why people buy a private ferritin test in the UK

Iron deficiency is the world's most common nutritional deficiency, and it's significantly more common in UK adult women than the public-health messaging implies. Menstruating women, vegetarians and vegans, frequent endurance athletes, and people with absorption issues (coeliac, post-bariatric) are all routinely iron-depleted without being formally anaemic. The fatigue that follows is a classic NHS misdirection: GPs will often run a full blood count, see haemoglobin within range, and conclude there's no iron problem. Without ferritin, that conclusion is premature — you can be substantially iron-depleted with normal haemoglobin for months before it shows in the FBC.

Private ferritin testing fills two gaps: (1) the GP who didn't order ferritin in the first place, and (2) the symptomatic patient who wants the test in days rather than weeks. For the clinical background of what ferritin actually measures, see the ferritin test page. This guide is the UK buying view.

UK private ferritin / iron test cost (May 2026)

Tracked live in the UK Private Blood Test Pricing Index. Bands as of 17 May 2026:

• Ferritin only (fingerprick): from £19 (Medichecks). The cheapest sensible test for iron deficiency.
• Iron studies (ferritin, serum iron, TIBC, transferrin saturation): £29–£55.
• Ferritin + FBC (combines iron stores with the haemoglobin/MCV picture): £35–£59. The most clinically useful combination for fatigue investigation.
• Iron + B12 + folate (covers the three main nutritional anaemias): £49–£69.
• Full anaemia panel (iron studies + FBC + B12 + folate ± CRP): £59–£89.
• Premium clinic-based: £100+ for venous draw and clinical-team review.

The £19 standalone ferritin is the right test if you have a specific concern about iron stores and no symptoms suggesting overt anaemia. If you're fatigued and don't know whether it's iron, B12 or folate, the £49–£69 anaemia panel is better value than buying three separate tests.

Ferritin vs serum iron vs transferrin: what each one does

Iron metabolism is unhelpfully complex for a buyer's guide, but the practical version is:

• Ferritin: a protein that stores iron in cells. Serum ferritin reflects total body iron stores. Low ferritin = depleted stores. Best single test for diagnosing iron deficiency.
• Serum iron: circulating iron at the time of the test. Fluctuates significantly by time of day and recent meals. On its own, not very useful.
• Total iron-binding capacity (TIBC): how much iron the blood can theoretically carry. Rises when stores are low (the body upregulates carrier protein).
• Transferrin saturation: serum iron ÷ TIBC × 100. Reflects how "full" the carrier protein is. Low = deficiency; very high (≥45%) can flag haemochromatosis (iron overload).

For iron deficiency, ferritin alone is usually enough. For overload (suspected haemochromatosis, family history), transferrin saturation is the better screening test. For a full picture, get both — that's what "iron studies" means on a private panel.

The ferritin pitfall: inflammation

Ferritin is an acute-phase reactant. That means it rises with:

• Active infection (acute or chronic)
• Autoimmune disease (rheumatoid arthritis, IBD, lupus etc.)
• Obesity (low-grade inflammation)
• Liver disease (hepatocyte damage releases stored ferritin)
• Recent strenuous exercise
• Excessive alcohol intake

If you have any of those and your ferritin comes back "normal" or even high, the number may not reflect actual iron stores. The standard correction is to order CRP alongside ferritin: if CRP is elevated and ferritin is in the lower part of the range, you're probably still iron-depleted; the inflammation has artificially lifted the reading. Some UK iron panels include CRP by default — worth checking what's in the bundle before buying.

When to test (and a few gotchas)

• Time of day: ferritin has minimal diurnal variation; morning vs afternoon doesn't really matter for ferritin. Serum iron does vary, so morning fasted is best for full iron studies.
• Iron supplements: stop oral iron 24–48h before testing serum iron / transferrin saturation. Ferritin is less affected but still worth pausing if possible.
• Recent infection or surgery: wait 4–6 weeks for the acute-phase response to settle.
• Menstruation: there's no need to time around the cycle, but heavy bleeders should retest periodically across the cycle to track replacement.

UK providers that sell ferritin / iron tests in 2026

• Medichecks — broadest UK single-marker catalogue, ferritin from £19, fingerprick or venous. The default low-friction option.
• Thriva — subscription model that suits longitudinal iron tracking (heavy menstrual bleeders, athletes); strong trend dashboards.
• Forth — premium positioning, strong on bundled anaemia panels with CRP included.
• MyHealthChecked — competitive on price.
• Randox Health — clinic-based, premium, comprehensive multi-marker panels.
• Superdrug Health Clinic — high-street option, slightly pricier but useful for in-store pickup.

Note: LetsGetChecked UK has dropped standalone iron / ferritin testing in 2026 (full investigation in our LGC catalogue piece). If you see an older guide recommending LGC for iron testing, it's out of date.

How to read your ferritin / iron result

Typical UK reference ranges (your provider's report will show their specific ranges):

• Ferritin (women): 13–150 µg/L. Some labs report 30–300. Functionally, <30 µg/L is iron-depleted even if "in range".
• Ferritin (men): 30–400 µg/L. <50 µg/L is functionally depleted.
• Serum iron: 11–32 µmol/L typical adult range.
• TIBC: 41–77 µmol/L typical adult range.
• Transferrin saturation: 20–45%. <20% suggests deficiency; ≥45% can flag overload.

Clinical pattern recognition:

• Low ferritin (<30), low transferrin saturation (<20%): iron deficiency. Replace and retest at 12 weeks.
• Normal ferritin, low transferrin saturation: possible early deficiency or inflammation masking; check CRP.
• High ferritin, high transferrin saturation: investigate for haemochromatosis. See a GP.
• High ferritin, normal transferrin saturation: usually inflammation, liver disease or obesity-related rather than iron overload.

For deeper interpretation see how to read blood test results.

FAQ

Related on Blood Test Guide UK

• Private blood tests UK — pillar guide — the complete UK private testing playbook.
• Ferritin test deep-dive — marker science and reference ranges.
• Best blood test for tiredness UK — broader fatigue workup.
• Private B12 & folate test UK — the second commonest anaemia marker.
• Private coeliac blood test UK — coeliac is one of the most-missed causes of iron deficiency.
• Best women’s health blood test UK — heavy menstrual bleeding context.
• Liver health blood test UK — raised ferritin and haemochromatosis context.
• Private cortisol test UK — if low ferritin doesn't explain the tiredness, cortisol is the next layer.
• Private cardiovascular risk test UK — chronic anaemia worsens cardiac strain; check ApoB and Lp(a) alongside.
• Private blood test cost UK 2026 — pricing across providers.
• Best UK private blood test providers (2026)