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Transferrin saturation (TSAT) is a medical laboratory value measured as a percentage. This value is the ratio of serum iron and total iron binding capacity for human body. Also this value tells a clinician how much serum iron are actually bound.

Usual values:

Normal reference ranges are:

• Serum iron: 60–170 μg/dl (10–30μmol/L)
• TIBC: 240–450 μg/dl
• Transferrin saturation: 15–50% (males), 12–45% (females)

μg/dl = micrograms per deciliter.