500 mL of blood in 14 days 500 - 750 mL of blood in 14 days (unless approved by the Principal Investigator) 1000 mL of blood in 90 days 1250 mL of blood in 120 days 1500 mL of blood in 180 days 2000 mL of blood in 270 days 2500 mL of blood in 1 year 13) Presence of values that are significantly different from normal reference ranges, as judged by the physician