RecruitingPhase 1Biological interventionComparative Analysis of Biotinylated, Irradiated and 51-Chromium Radiolabeled Red Blood Cells for Analysis of Recovery and Survival After Autologous TransfusionThis research is being done to compare the red blood circulation survival in healthy adult volunteers between the 51 chromium (51Cr) red blood cell (RBC) labeling method and the Biotin (BioRBC) red blood cell (RBC) labeling method to determine if biotinylated red blood cells (BioRBC) is an acceptable non radioactive alternative to 51 chromium (51Cr) radiolabeling for regulatory pharmacokinetic studies of red blood cell products.