Our integrated Transfusion Services workgroup is reviewing the requirements for serological centrifuge calibration. After reviewing both AABB (stds 3.2 and 3.5) and CAP regulations (TRM.31900, COM.30600,COM.30625,COM.30550) and manufacturer's inserts, the group still is not in accord about a standard policy. The need to perform calibration upon receipt and after repair is very straight forward. But for years many of the group have performed this task annually. That is not mandated anywhere and the "functionality" testing or "defined intervals" lines in the regs leave this open to interpretation. Therefore we wished to poll this group to see what our peers are doing. We would love to hear what other sites are doing to determine if there might be a national best practice in the US as part of our review before making a final policy determination.