Nearly two decades using the check-type to prevent ABO incompatible transfusions: one institution's experience

Am J Clin Pathol. 2006 Sep;126(3):422-6. doi: 10.1309/C6U7VP87GC030WMG.


To detect miscollected (wrong blood in tube [WBIT]) samples, our institution requires a second independently drawn sample (check-type [CT]) on previously untyped, non-group O patients who are likely to require transfusion. During the 17-year period addressed by this report, 94 WBIT errors were detected: 57% by comparison with a historic blood type, 7% by the CT, and 35% by other means. The CT averted 5 potential ABO-incompatible transfusions. Our corrected WBIT error rate is 1 in 3,713 for verified samples tested between 2000 and 2003, the period for which actual number of CTs performed was available. The estimated rate of WBIT for the 17-year period is 1 in 2,262 samples. ABO-incompatible transfusions due to WBIT-type errors are avoided by comparison of current blood type results with a historic type, and the CT is an effective way to create a historic type.

MeSH terms

  • ABO Blood-Group System / immunology*
  • Blood Group Incompatibility / prevention & control*
  • Blood Transfusion*
  • Humans
  • Medical Errors / prevention & control*


  • ABO Blood-Group System