HAMP and autoimmune hemolytic anemia: Positive correlations were found between immunoglobulin M (IgM) and serum hepcidin (r = 0.5505, p = 0.0097), and between ferritin and the hemolytic indicators TBIL and DBIL (r = 0.4113, p = 0.0330; r = 0.4338, p = 0.0238), as well as the inflammatory biomarker CRP (r = 0.6270, p = 0.0024) in patients with AIHA (Figure 2).