A variety of laboratory tests can be used to aid in the diagnosis of HIT. A complete blood count is always necessary and will show low platelet count. A high value of the PF4 IgG optical density can suggest HIT. Confirmatory testing is done with the serotonin release assay (SRA),<unk><unk>  platelet aggregation (HIPA) assay, or other functional assay. These confirmatory tests have high specificity.
Heparin-induced thrombocytopenia laboratory findings
Glanzmann's thrombasthenia laboratory findings
Antiphospholipid syndrome laboratory findings
Disseminated intravascular coagulation laboratory findings
Heparin-induced thrombocytopenia physical examination
Thrombocytopenia laboratory findings
Disseminated intravascular coagulation physical examination
Antiphospholipid syndrome physical examination