Clinical case time line. The case begins with CABG and chronicles major events thereafter. The platelet count over time, with a classic “biphasic” pattern, is illustrated above the time line. Events in the diagnostic process are highlighted in green when less consistent with HIT and in red when more concerning for HIT. Assay results are indicated on the day results are returned; both EIA and SRA were collected on POD 6. The anticoagulation use across time is presented, with each agent highlighted in a unique shade of blue. The length of the shade illustrates the duration of that anticoagulant along the time line. The care setting indicates when the patient was hospitalized and discharged relative to the time line. BID, twice daily; DVT, deep vein thrombosis; LMWH, low-molecular-weight heparin; m, month; UFH, unfractionated heparin.