TF and Iron deficiency anemia: Further evaluation revealed positive fecal occult blood, significant iron deficiency (ferritin 2.1 ng/mL, normal 10.0–67.4 ng/mL; transferrin 377 mg/dL, normal 180–370 mg/dL; transferrin saturation 2.0%, normal 6%–40%), normal prothrombin time, partial thromboplastin time, and international normalized ratio, negative Helicobacter pylori stool antigen, normal fecal calprotectin, and negative infectious stool studies.