A low mean corpuscular volume with a normal and cell distribution width suggests -: (A) Iron deficiency anemia, (B) B thalassemia trait, (C) Anemia of chronic disease, (D) Sideroblastic anemia
Answer is B. In thalassemia MCV is decreased to 45-70fL &RBC count found to be increased or normal. The RBCs are microcytic and normochromic. Ref: Exam preparatory manual for UGs by Ramdas Nayak Page no:270 Ref Robbins 9/e pg 412