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Iron Studies

Transferrin Saturation

Normal range 20–50 % (0.2–0.5 fraction SI). Specimen: Serum (calculated).

Also known as: iron saturation, TSAT.

20–50 %Reference range

Reference range

Conventional%
2050
SIfraction
0.20.5
SpecimenSerum (calculated)
Conventional range20–50 %
SI range0.2–0.5 fraction
Conversion factor×0.01 (conventional → SI)
PanelIron Studies

Convert any Transferrin Saturation result between units on the unit converter.

What is the normal range for Transferrin Saturation?

The standard teaching reference range for Transferrin Saturation is 20–50 % in conventional units, or 0.2–0.5 fraction in SI units. This value is measured in serum (calculated).

Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population — always use the range printed on the actual result.

Above the range

Common causes of a high Transferrin Saturation

  • Hemochromatosis / iron overload

Below the range

Common causes of a low Transferrin Saturation

  • Iron-deficiency anemia
  • Chronic disease

At the bedside

Nursing considerations

  • Calculated as serum iron ÷ TIBC × 100; low in iron deficiency, high in overload.

Study aid

Your notes on Transferrin Saturation

Same panel

More Iron Studies tests

Ferritin12–300 ng/mLSerum Iron60–170 µg/dLTotal Iron-Binding Capacity (TIBC)240–450 µg/dLTransferrin200–360 mg/dL