Serum iron: what your result means.

The amount of iron circulating in the blood, available for immediate use. Serum iron is measured by blood test as part of the Organ panel in the HodieLabs Health Blueprint.

Why Serum iron matters

Serum iron has significant diurnal variation (highest in morning) and is affected by recent meals. Never base iron status on serum iron alone. Always interpret with ferritin and transferrin saturation.

Associated risks when out of range: Low serum iron contributes to anaemia, fatigue, and impaired cognitive function. High serum iron may indicate haemochromatosis or iron overload, which drives oxidative damage.

Evidence basis

The HodieLabs Evidence-Based Clinical Library classifies Serum iron as an strong evidence-tier biomarker. Its reference ranges come from a published authority standard rather than from observational optimisation targets. The standard used here is RCPA Australian pathology reference intervals; serum iron 10–30 umol/L normal. Where relevant clinical outcomes are noted on this page, they reflect the guideline literature referenced below.

Evidence-based reference ranges

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

Clinical interpretation

• Serum iron has significant diurnal variation (highest in morning) and is affected by recent meals.
• Never base iron status on serum iron alone. Always interpret with ferritin and transferrin saturation.
• Best measured fasting, in the morning, away from iron supplements (48h washout).

What improves it: the evidence-based levers

• Interpret with ferritin and TSAT. Serum iron alone fluctuates significantly with meals and time of day
• Iron supplementation only when deficiency is confirmed (ferritin + TSAT)

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

How Serum iron testing works at HodieLabs

Serum iron 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. RCPA Australian pathology reference intervals; serum iron 10–30 umol/L normal.

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.