ABSTRACTBACKGROUNDLimited blood inventory and resupply chains in combat settings can result in preventable deaths from traumatic hemorrhage. One way of mitigating this could be to establish donor pools where blood is collected in advance of high-risk missions and then reinfused back to the donor if not needed to treat casualties.METHODS450+56 mL blood was collected, rested for 2 hours in room temperature and stored at 4 °C. The blood was reinfused 22-24 hours after donation and the donor observed for adverse reactions. Samples were collected before and 20 minutes after each donation for hematology, IgG, ferritin, CRP, total protein, LDH, bilirubin, haptoglobin and APTT.RESULTS9 participants went through a total of 36 donation and reinfusion procedures. 4 donors participated in 5 rounds, 2 in 4 rounds, 2 in 3 rounds, and 1 in 2 rounds. A significant drop was seen in hemoglobin (14.6 ± 0.9 to 13.9 ± 0.9) and ferritin (179 ± 70 to 149 ± 78) from before first donation to after the last reinfusion (p
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