title: Discrimination between iron-deficiency and heterozygous-thalassaemia syndromes in differential diagnosis of microcytosis.
abstract: Three formulae have been advocated for interpreting the blood-count when differentiating between iron deficiency and heterozygous thalassaemia: the discriminant function. M.C.V.-R.B.C.-(5 X Hb)-k, the M.C.V/R.B.C. ratio, and the (M.C.V.)2 X M.C.H. product. In a comparison of their diagnostic accuracy in microcytic adults from several countries, the discriminant function was the most satisfactory. 417 of 455 uncomplicated cases (91.6%) of iron deficiency, heterozygous alpha1- and beta- thalassaemia were correctly identified. The function was not able to distinguish heterozygous alpha2-thalassaemia from iron deficiency. A flow chart illustrates how the discriminant function can be used in haematological practice.
mesh_terms: D000747:Anemia, Hypochromic / Q000097:blood / Q000175:diagnosis*; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D004906:Erythrocyte Count; D004911:Erythrocyte Volume; D004913:Erythrocytes, Abnormal / Q000473:pathology; D006441:Hemoglobin A / Q000032:analysis; D006579:Heterozygote; D006801:Humans; D013789:Thalassemia / Q000097:blood / Q000175:diagnosis* / Q000235:genetics
chemical_list: D006441:Hemoglobin A