Ferritin: what your result means.

Ferritin reflects your body's iron stores. Both directions matter: low ferritin causes fatigue and impaired performance long before anaemia appears, while persistently high ferritin can signal inflammation, metabolic dysfunction or iron overload.

Why Ferritin matters

Iron deficiency is one of the most common and most fixable causes of fatigue, especially in menstruating women and endurance athletes. High ferritin warrants investigation too. It behaves as an acute-phase reactant, so elevated values must be interpreted alongside inflammation markers like hs-CRP.

Associated risks when out of range: Iron deficiency (low). Iron overload/inflammation (high), Fatigue/poor performance (low).

What the clinical evidence shows

The evidence base behind how the HodieLabs Evidence-Based Clinical Library interprets Ferritin, from randomised trials, prospective cohorts and genetic (Mendelian randomisation) studies. Full citations in the reference list below.

• Randomised trial in fatigued women (Vaucher et al. CMAJ 2012): in non-anaemic menstruating women with ferritin below 50 µg/L and unexplained fatigue, oral iron significantly reduced fatigue versus placebo. Deficiency matters before anaemia appears.
• BMJ double-blind RCT (Verdon et al. 2003): iron supplementation improved unexplained fatigue in non-anaemic women, with benefit concentrated in those with low-normal ferritin, validating ferritin, not haemoglobin, as the marker to watch.
• Busselton haemochromatosis study (Olynyk et al. NEJM 1999): Australian population screening showed clinically significant HFE haemochromatosis is common enough (C282Y homozygosity ~1 in 190 of northern-European ancestry) that persistently high ferritin always warrants investigation.

Evidence-based reference ranges

The HodieLabs Evidence-Based Clinical Library interprets Ferritin against published clinical authority standards, never arbitrary "optimal" ranges. Measured in µg/L:

Clinical interpretation

• Ferritin is an acute phase reactant, elevated in inflammation, infection, and liver disease regardless of iron status.
• Low ferritin (<30 µg/L) is diagnostic of iron deficiency even with normal haemoglobin (RCPA).
• RCPA notes ferritin can appear "normal" up to 100 µg/L when iron deficiency coexists with inflammation.
• Very high ferritin (>300 µg/L in men, >200 in women) warrants investigation for haemochromatosis, liver disease, or inflammation.
• CONTEXT RULE: If ferritin is borderline or unexpectedly high, require CRP/hs-CRP, transferrin saturation (TSAT), liver markers (ALT/GGT), and inflammatory status before assigning "adequate iron" or "iron overload" narratives.

What improves it: the evidence-based levers

• Iron optimisation guided by full iron studies
• Investigate inflammation if high

Recommended testing frequency: Annual, as part of a comprehensive panel. Single markers are always interpreted in context.

How Ferritin testing works at HodieLabs

Ferritin is measured in every Health Blueprint at our Melbourne Preventative Health & Longevity Clinic, interpreted by a doctor against the guideline-cited ranges above and tracked over time through your HodieLabs membership.

References

1. Vaucher P, et al. Effect of iron supplementation on fatigue in nonanemic menstruating women with low ferritin: a randomized controlled trial. CMAJ. 2012;184:1247–1254.
2. Verdon F, et al. Iron supplementation for unexplained fatigue in non-anaemic women: double blind randomised placebo controlled trial. BMJ. 2003;326:1124.
3. Olynyk JK, et al. A population-based study of the clinical expression of the hemochromatosis gene. N Engl J Med. 1999;341:718–724.

This page is general information from the HodieLabs Evidence-Based Clinical Library, not medical advice. Speak with your GP about what testing and care is appropriate for you.