A simplified outline of HIT diagnosis or exclusion and consequent actions. The study by Linkins et al1 addresses some of the possible choices (refer to bold red font text). CLIA, chemiluminescence assay; HEP, HIT expert probability score; HIPA, heparin-induced platelet activation assay; IgG, immunoglobulin G; LIA, latex particle-enhanced immunoturbidimetric assay; LFIA, lateral flow immunoassay.