Human platelets survive “normally” when infused into NOD/scid mice as a suspension in normal citrated plasma or serum containing 0.02M sodium citrate. Values shown are the average of triplicate experiments ± 1 SEM. Survival values at 24 hours of platelets suspended in normal plasma or serum was 70% ± 15% and 84% ± 11% of the baseline (time 0) values, respectively.