In silent carrier alpha thalassemia, anemia is absent. The red blood cell count is within normal limits. Hemoglobin is also within normal limits. The MCHC (mean corpuscular hemoglobin concentration) and MCV (mean cell volume) are normal to slightly decreased. The RDW (red cell distribution width) is within normal limits. Red blood cell morphology and reticulocyte percentatge are normal.
Hemoglobin electrophoresis demonstrates a normal adult pattern:
Hb A - 95-98%
Hb A2 - 1.5-3.7%
Hb F - <2%
Note: Neonates have 1-2% Bart's Hemoglobin (gamma chain tetramers). Hb H inclusions are rarely seen. Bone marrow is also normal.