Which of the following laboratory tests is used to diagnose and monitor the treatment of heparin-induced thrombocytopenia?

A Prothrombin time
B Activated partial thromboplastin time
C Platelet count and PF4 antibody assay ✓
D D-dimer assay

Explanation

The diagnosis of heparin-induced thrombocytopenia (HIT) is based on a combination of clinical suspicion and laboratory testing, including a decrease in platelet count and the presence of antibodies against platelet factor 4 (PF4).

Source

Hematology journals and textbooks
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Hard MEDICAL Confidence: high