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Soluble Transferrin Receptor

sTfR Soluble Transferrin Receptor Level
Serum (SST) mg/L

About this test

Truncated form of the cellular transferrin receptor shed into the bloodstream proportional to erythropoietic activity and iron demand. Unlike ferritin, not an acute-phase reactant — useful for detecting iron deficiency in the presence of inflammation.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs 2.2 – 5 Adult; elevated with iron deficiency or erythroid expansion

Clinical Interpretation

Low / Decreased
Low — aplastic anaemia, low erythropoietic activity.
High / Increased
Elevated — iron deficiency (even when ferritin is falsely normal due to inflammation), haemolytic anaemia, thalassaemia, polycythaemia, ineffective erythropoiesis.

Related Tests

Reticulocyte Count Serum Iron Ferritin
Specimen
Serum (SST)
Reporting Unit
mg/L
Category
⚙️ Iron Studies

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.