A patient on Phenytoin therapy develops depression, for which he was prescribed tricyclic anti-Depressants. He now complains of lassitude and his Hb reading is 8gm/dl, the next step in the management of this patient is:: (A) Chest X ray, (B) MCV should be estimated, (C) GGT should be estimated, (D) None of the above
Answer is B. phenytoin can induce folate deficient megaloblastic anemia that can be diagnozed by measuring MCV. REF: KD TRIPATHI 8TH ED.