Serum hepcidin and iron in patients under heparin treatment. (A) Time-course of serum hepcidin levels in 5 subjects during heparin therapy. (B) Time-course of serum iron concentration in 4 subjects. (C) Time-course of circulating C-reactive protein concentration in 4 subjects. The data on C-reactive protein and serum iron were not available for 1 subject.