<prompt> With oral iron therapy, rise in Hb can be seen after:1 week3 weeks4 weeks6 weeks  <response>: Rise in hemoglobin with oral iron 0.7 gm-1 gm per week, which is seen after 3 weeks of initiation of oral therapy.According to COGDT, 10ed, p 407 Hemoglobin levels should increase by atleast 0.3gdlweek if the patient is responding to therapyIf there is no significant clinical or hematological improvement within 3 weeks, diagnostic re-evaluation is needed. 