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Iron Saturation%

Iron saturation is the share of the iron-carrying protein transferrin that is actually carrying iron.

See your own Iron Saturation on its range.

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What Iron Saturation measures

Iron saturation is the share of the iron-carrying protein transferrin that is actually carrying iron.

If your Iron Saturation is low

Iron saturation below the range is commonly associated with low iron stores or inflammation.

Commonly associated with

Worth asking your clinician: Whether ferritin and a CBC clarify it.

If your Iron Saturation is high

Iron saturation above the range is commonly associated with iron overload or recent supplements; it is read with ferritin.

Commonly associated with

Worth asking your clinician: Whether ferritin is also high and whether a repeat fasting sample is useful.

Typical reference range

GroupTypical range
Adults15 – 55 %

Typical adult values used by many US labs. Your own report prints the range your lab validated for its method, and that range is the one that counts. Labwise always uses the printed range first.

If it is within range

Your iron saturation is within the range printed by your lab.

Also listed as

Iron Sat, % Saturation, Saturation, Iron, Transferrin Saturation, % Sat, Iron % Saturation, %SAT

Related tests

This page is general information about what a laboratory test measures and what results outside a reference range are commonly associated with. It is not medical advice, does not diagnose any condition and does not replace your clinician. Discuss your results with your healthcare provider.