This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical, surgical and gynaecological illness complicating pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following parameters will fall the earliest in iron deficiency \nSelect and explain. \nA. MCV, B. MCH, C. MCHC, D. Red cell distribution width', 'role': 'user'}, {'content': 'Answer: A \nExplanation: MCV is reduced in iron defeciency while a high value indicates macrocytic anaemia The first red cell index to become abnormal is MCV But it maynot be found always even in established iron defeciency as the increased drive to erythropoiesis results in large propoion of young large cells A typical iron deficiency anemia shows the following blood values: Hemoglobin--less than 10 gm% Red blood cells --less than 4 million/mm3 PCV--less than 30% MCHC -- less than 30% MCV -- less than 75 u3 MCH--less than 25 pg Reference: Textbook of Obstetrics,Sheila Balakrishn; 2nd edition; Pgno:285', 'role': 'assistant'}]