title: The Hippocratian principle of 'primum nil nocere' demands that the metabolic state of a donor should be normalized prior to a subsequent donation of blood or plasma. How much blood, relative to his body weight, can a donor give over a certain period, without a continuous deviation of iron metabolism in the direction of iron deficiency?
mesh_terms: D000042:Absorption; D000293:Adolescent; D000328:Adult; D000368:Aged; D000747:Anemia, Hypochromic / Q000097:blood / Q000175:diagnosis / Q000209:etiology; D001782:Blood Donors; D001815:Bloodletting / Q000009:adverse effects*; D001835:Body Weight; D004032:Diet; D005260:Female; D005293:Ferritins / Q000097:blood; D006454:Hemoglobins; D006625:Hippocratic Oath; D006801:Humans; D007501:Iron / Q000097:blood*; D008297:Male; D008875:Middle Aged; D011247:Pregnancy; D013997:Time Factors
chemical_list: D006454:Hemoglobins; D005293:Ferritins; D007501:Iron