When an unidentified trauma patient is admitted through the ER we do not process that sample until we get a second sample from another location. The two samples are then run in parallel. Until this is done we give O cells and AB plasma. The rationale is that in the "heat" of the moment the ER/Trauma staff is more likely to mislabeled samples or misidentified patients (in the case of multiple trauma). If the patient is admitted through the ER or any other location and has a medical record # and historical blood type then we only need 1 sample but we perform a type and screen and an ABO confirm, meaning two different techs are checking the ABO results, before we XM any units for the patient, this of course if times permits, if they need blood STAT we need Dr. approval to give type specific before we complete the ABO confirm.