Bone marrow aspiration, colonoscopy and upper GI endoscopy can be done to look for the cause of<unk>  deficiency anemia.
Iron deficiency anemia other diagnostic studies
Folate deficiency other diagnostic studies
Hemolytic anemia other diagnostic studies
Iron deficiency anemia echocardiography or ultrasound
Sideroblastic anemia risk factors
Paroxysmal nocturnal hemoglobinuria other diagnostic studies
Hemolytic anemia Echocardiography or Ultrasound
Folate deficiency differential diagnosis