Iron Deficiency Anemia Management

Diagnosis and Laboratory Interpretation

Hemoglobin levels of 8.3 g/dL represent severe anemia requiring urgent investigation, as lower hemoglobin levels correlate with more serious underlying pathology, according to the European Society of Gastrointestinal Endoscopy 1
Microcytosis (MCV 70 fL), hypochromia (MCH 18.8 pg, MCHC 27.0 g/dL), and severely reduced iron (15 μg/dL) and transferrin saturation (3%) are classic findings of iron deficiency, with hypochromia being a reliable marker, as stated by the American Gastroenterological Association 3
Elevated RDW (15.7%) can indicate combined deficiency states (iron plus folate/B12), as reported by the European Society of Gastrointestinal Endoscopy 4
Folate levels <2.0 ng/mL suggest concurrent folate deficiency, which can mask microcytosis and explain the elevated RDW in a combined deficiency state, according to the American Gastroenterological Association 4

The American College of Gastroenterology recommends starting oral iron supplementation immediately with 65 mg elemental iron daily as first-line therapy, with a expected hemoglobin response within 2 weeks 2
Intravenous iron should be considered if oral iron is not tolerated, malabsorption is suspected, or losses exceed oral replacement capacity, as stated by the European Society of Gastrointestinal Endoscopy 1
Iron therapy should continue until hemoglobin normalizes and iron stores are repleted (ferritin >100 ng/mL), according to the American Gastroenterological Association 1

For men and post-menopausal women with iron deficiency anemia, GI blood loss is the most common cause, and exclusion of GI malignancy is of prime concern, as reported by the European Society of Gastrointestinal Endoscopy 3
Upper endoscopy (OGD) with small bowel biopsies and colonoscopy are mandatory investigations to screen for coeliac disease, evaluate for gastric cancer, peptic ulcer disease, or angiodysplasia, and exclude colorectal cancer, polyps, or inflammatory bowel disease, according to the American College of Gastroenterology 1
Coeliac disease screening should be performed in all patients, as malabsorption is a common cause after GI blood loss, as stated by the European Society of Gastrointestinal Endoscopy 5

Blood transfusion should be reserved for patients with or at risk of cardiovascular instability due to the degree of anemia, as reported by the European Society of Gastrointestinal Endoscopy 1
At hemoglobin 8.3 g/dL, assessment for symptoms of cardiovascular compromise is essential before deciding on transfusion, according to the European Society of Medical Oncology 6