CBC Findings in Alpha Thalassemia Trait

Laboratory Parameters in Alpha Thalassemia Trait

• The American College of Medical Genetics recommends that Mean Corpuscular Volume (MCV) values are typically low, with values often below the 5th percentile for age and frequently below 80 fL, in individuals with alpha thalassemia trait 1, 2
• Normal ferritin levels are expected in alpha thalassemia trait, which helps differentiate it from iron deficiency anemia 1
• Red Blood Cell (RBC) count is normal or elevated in alpha thalassemia trait, which is an important differentiating factor from iron deficiency anemia 1
• Red Blood Cell Distribution Width (RDW) is usually normal (≤14.0%) in alpha thalassemia trait, which is an important differentiating factor from iron deficiency anemia 1

Clinical Implications

• Genetic counseling is important for individuals with alpha thalassemia trait, particularly for reproductive planning, as certain combinations of alpha thalassemia mutations in parents can lead to more severe conditions in offspring, including Hemoglobin H disease or even Hemoglobin Bart's hydrops fetalis 2
• The American College of Obstetricians and Gynecologists notes that alpha thalassemia is the most common cause of non-immune hydrops fetalis in Southeast Asian populations 3