title: Comparison of radioisotope methods and a nonradioisotope method to measure the RBC volume and RBC survival in the baboon.
abstract: BACKGROUND
  RBC volume, 24-hour posttransfusion survival, and life span can be measured with radio-isotopes and nonradioactive procedures.
  
  
  METHODS
  RBC volume was measured directly with autologous baboon RBCs labeled with biotin-X-N-hydroxysuccinimide (NHS), 51Cr, 99mTc, and 111In-oxine and indirectly from the 125I plasma volume and the total body Hct. Twenty-four-hour posttransfusion survival and life span were measured in autologous fresh baboon RBCs labeled with 51Cr, 111In-oxine, 99mTc, and biotin-X-NHS.
  
  
  RESULTS
  Significantly larger RBC volumes were observed when the fresh autologous RBCs were labeled with 51Cr, 111In-oxine, or 99mTc than when they were labeled with the nonradioactive biotin-X-NHS. Twenty-four-hour posttransfusion survival values were significantly lower in the RBCs labeled with 111In-oxine or 99mTc than in the RBCs labeled with 51Cr.
  
  
  CONCLUSIONS
  The greater in vivo elution of 51Cr, 111In-oxine, and 99mTc than that of biotin-X-NHS influenced the measurements of RBC volume, 24-hour posttransfusion survival, and life span of the fresh baboon RBCs.
mesh_terms: D000818:Animals; D001804:Blood Transfusion, Autologous; D002860:Chromium Radioisotopes; D004905:Erythrocyte Aging; D017707:Erythrocyte Transfusion; D004911:Erythrocyte Volume; D005260:Female; D007205:Indium Radioisotopes; D010215:Papio; D013667:Technetium
chemical_list: D002860:Chromium Radioisotopes; D007205:Indium Radioisotopes; D013667:Technetium