The Mentzer Index and Pregnancy: Differentiating Between Iron Deficiency and Thalassemia

Anemia during pregnancy is a common condition with significant risks for both maternal and fetal health. The two primary causes of anemia in pregnancy—iron deficiency anemia (IDA) and thalassemia trait (TT)—require distinct treatment strategies. The Mentzer Index, a simple and cost-effective diagnostic tool, helps differentiate between these two types of anemia by calculating the ratio of mean corpuscular volume (MCV) to red blood cell (RBC) count. This review explores the role of the Mentzer Index in improving anemia diagnosis and management in pregnancy, highlighting its benefits and limitations. The Mentzer Index is calculated by dividing the MCV by the RBC count, with values greater than 13 typically indicating IDA and values less than 13 suggesting TT. The index offers a quick and accessible method for distinguishing between these two conditions, enabling healthcare providers to administer appropriate treatments, such as iron supplementation for IDA or genetic counseling for TT. Early and accurate diagnosis through the Mentzer Index can reduce the risk of complications such as preterm birth and low birth weight, while ensuring appropriate anemia management for pregnant women. Keywords: Mentzer Index, Pregnancy, Iron Deficiency, Thalassemia, Anemia Diagnosis