Microcytic Hypochromic Anemia Diagnosis and Management

Introduction to Microcytic Hypochromic Anemia

Low MCV and low MCH values indicate microcytic (smaller-than-normal) and hypochromic (pale) red blood cells, according to the National Comprehensive Cancer Network 1, 2
Mean Corpuscular Volume (MCV) measures the average size of red blood cells in femtoliters (fL), with a low MCV (<80 fL) indicating microcytosis or smaller-than-normal red blood cells 1, 3
Mean Corpuscular Hemoglobin (MCH) measures the average hemoglobin content per red blood cell, with a low MCH indicating hypochromia or pale red blood cells due to decreased hemoglobin content 2, 4

Microcytic hypochromic anemia is typically associated with iron deficiency anemia, thalassemia, anemia of chronic disease, and sideroblastic anemia 1, 3, 5
Serum ferritin is the most specific test for iron deficiency in the absence of inflammation 2, 4
Transferrin saturation and TIBC are helpful when iron deficiency is suspected 3, 6
Red cell distribution width (RDW) is often elevated in iron deficiency anemia but may be normal in thalassemia 8
Hemoglobin electrophoresis is recommended when thalassemia is suspected 2

Identifying microcytic hypochromic anemia through low MCV and low MCH values is clinically important because it narrows the differential diagnosis to conditions affecting hemoglobin synthesis and guides further diagnostic testing to determine the specific cause 1, 2, 4
Early identification and treatment of iron deficiency can prevent significant morbidity, especially in vulnerable populations 2, 4