Which of the following laboratory tests is used to differentiate between iron deficiency anemia and anemia of chronic disease?

A Serum ferritin
B Transferrin saturation
C Soluble transferrin receptor (sTfR) index ✓
D Reticulocyte count

Explanation

The soluble transferrin receptor (sTfR) index is a laboratory test that helps differentiate between iron deficiency anemia and anemia of chronic disease by measuring the level of soluble transferrin receptors in the blood.

Mnemonic

_STFR = Separate → separate diagnosis

Source

Clinical Hematology: Theory and Procedures
Hematology Hematology: Anemia Hematology: Anemia Hard MEDICAL Confidence: medium