To observe the role of Mentzer index for differentiating iron deficiency anemia (IDA) and beta thalassemia trait (β TT) in pregnant women. This cross-sectional study was conducted in Gynaecology & Obstetrics Department of Nishtar Medical University ... Use this Mentzer index calculator to determine, if anemia is more probably due to iron deficiency or thalassemia. Use this tool to calculate the Mentzer Index , a haematological index that helps differentiate between iron deficiency anemia and beta thalassemia. Learn the formula, the purpose, and the references of this index . Use this calculator to estimate the likelihood of thalassemia based on MCV and RBC count. The Mentzer index is a ratio of MCV to RBC that can help distinguish thalassemia from iron deficiency anemia.