Previous studies related to ND-CKD and iron deficiency have noted a non-significant decrease in NT-proBNP following intravenous iron administration (1000 mg FDI) (baseline: 422.5 (881.9) pg/mL to 1-month: 242.5 (209.1) pg/mL)26. Here, NPPB is linked to Iron deficiency anemia.