ID/IDA is commonly caused by gastrointestinal (GI) blood loss, inflammatory bowel disease (IBD), heavy uterine bleeding, and postpartum hemorrhage.(47) A systematic review and meta‐analysis of prospective studies with FCM and ferric derisomaltose (FDI) suggested that the risk factors for hypophosphatemia are the type of iron preparation (higher with FCM), the degree of iron deficiency (more likely if ferritin or transferrin saturation are low), and kidney function (more likely if renal function is normal).(47). The gene discussed is TF; the disease is inflammatory bowel disease.