This is a confirmatory test for heparin-induced thrombocytopenia (HIT). It is not offered as a stand-alone test, but rather is a reflex test for all positive platelet factor-4 (PF4) tests: coded as HITAB. HITAB has excellent sensitivity and a negative test largely rules out HIT. Repeat HITAB in a few days may be indicated in situations with a very compelling clinical picture for HIT. Please refer questions to Dr. Gene Shaw (hematopathologist) or Jill Brantner (technical specialist in Hematology).
Sample should be spun down and taken off the red cells. Sample must be received within 7 days of draw date. Older samples are acceptable if they have been frozen. Submit refrigerated. If already frozen, send on dry ice.