HAMP and chronic kidney disease: Table 1 also showed that the median levels of serum GDF-15 [1024.5 (429.4–1489.5 pg/ml) vs. 447.25 (188.25–1192.3 pg/ml), P-value< 0.0001] and hepcidin [7.1 (3.9–36.2) vs 3.1(2.1–10.9), P-value < 0.0001], were more than doubled among the CKD participants as compared to the controls.