Which of the following laboratory tests is used to diagnose anemia by measuring the size and distribution of red blood cells?

A Reticulocyte count
B Mean corpuscular volume (MCV)
C Red blood cell distribution width (RDW) ✓
D Erythrocyte sedimentation rate (ESR)

Explanation

The red blood cell distribution width (RDW) is a laboratory test that measures the size and distribution of red blood cells, helping to diagnose and classify anemia.

Mnemonic

RDW = Red Distribution Width → size and distribution

Source

Clinical Chemistry: Theory, Analysis, Correlation
Hematology Hematology: Anemia Hematology: Anemia Easy MEDICAL Confidence: high