Which of the following laboratory tests is used to diagnose and monitor the progression of iron deficiency anemia?

A Serum ferritin ✓
B Total iron-binding capacity (TIBC)
C Reticulocyte count
D Erythrocyte sedimentation rate (ESR)

Explanation

Serum ferritin is a sensitive and specific marker for iron deficiency anemia, reflecting the body's iron stores.

Mnemonic

Ferritin = Iron storage → key test

Source

Harrison's Principles of Internal Medicine
Hematology Hematology: Anemia Hematology: Anemia Easy MEDICAL Confidence: high