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Lab marker guide

Serum iron

Iron carried in the blood together with the protein transferrin. It swings through the day and after meals, so it is read together with ferritin.

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How reports print it

FeСывороточное железоЖелезо в сывороткеЖелезоIron

What it shows

Iron carried in the blood together with the protein transferrin. It swings through the day and after meals, so it is read together with ferritin.

Units and conversion

Base unit: µmol/L.

  • 1 µg/dL = 0.1791 µmol/L · 1 µmol/L = 5.583 µg/dL

Typical ranges

Your laboratory’s range comes first — it is printed on the report next to the result. Below is one laboratory’s adult range with its method: a reference, not a rule.

WhoRange, µmol/L
Men11–28
Women6.6–26

Range source: Лаборатория Хеликс — Железо в сыворотке

Why it can be higher

Common reasons discussed with a doctor. This is not a diagnosis.

  • Taking iron medicines shortly before the test
  • Repeated blood transfusions
  • Iron overload

Why it can be lower

  • Low iron
  • Inflammation
  • Blood loss
  • Swings through the day

What to ask a doctor

  • Should ferritin and transferrin be checked?
  • Is it worth repeating in the morning, fasting?

Whom to see

A GP or internist.

Sources

Data checked against the sources in October 2026.