US standards require transfusion services to perform serological testing on red cells obtained from an integral donor tubing segment from cellular blood components to confirm the correctness of the ABO/Rh container label prior to transfusion. Units labeled Rh Negative must be tested with anti-D, but not Rh Positive units. Units labeled A, B or AB are tested with anti-A and anti-B and units labeled group O may be tested with anti-A,B only. Meditech standardly allows for a single test to document the above serological test results. This test is automatically ordered when a cellular blood component is logged into the system. For example, when an OPOS unit is logged, user is presented with a test requiring results entry for anti-A, anti-B, anti-A,B and anti-D despite a serological testing protocol using anti-A,B only. If an ABPOS unit is logged, again, 4 tests (anti-A, anti-B, anti-A,B and anti-D) must be resulted in some manner even though unit was tested with anti-A and anti-B only. This has been bugging me for years, but I finally figured out a way to configure Meditech so that if an OPOS unit is logged, only anti-A,B is reflexed; if an ABPOS unit is logged, only anti-A and anti-B are reflexed. To accomplish this requires creation of 3 different Order Groups, a T type test with Auto Result, a PRE type calculation using the keyword "bsp bt" and profile tests with T tests configured with anti-A, anti-B, anti-A,B and anti-D according to your testing protocols. If you are an interested Meditech user (I'm currently using C/S ver 5.66), please private email me via PathLabTalk.