Also, if your father donated blood frequently before his illness, then then the hemochromatosis would have not been apparent. They manage that disease with 3 - 4 blood donations per year to keep the iron down.
Marlene, wife to John DX w/SAA April 2002, Stable partial remission; Treated with High Dose Cytoxan, Johns Hopkins, June 2002. Final phlebotomy 11/2016. As of January 2017, FE is 233, HGB 11.7, WBC 5.1/ANC 4.0, Plts 146K.