<prompt> 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 8 gmdl, the next step in the management of this patient is:Chest X rayMCV should be estimatedGGT should be estimatedNone of the above  <response>: Ans. B MCV should be estimatedRef: KD T 8e p441Phenytoin can induce folate deficient megaloblastic anemia that can be diagnozed by measuring MCV. 