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

A Platelet count
B Activated partial thromboplastin time (aPTT)
C Anti-platelet factor 4 antibody assay ✓
D Prothrombin time (PT)

Explanation

The anti-platelet factor 4 antibody assay is a laboratory test used to diagnose and monitor the treatment of heparin-induced thrombocytopenia (HIT), a prothrombotic disorder caused by an immune response to heparin.

Source

American Journal of Hematology
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Medium MEDICAL Confidence: high