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

A PTT
B aPTT
C PF4 antibody test ✓
D Platelet aggregation test

Explanation

The PF4 antibody test is a specific test used to diagnose heparin-induced thrombocytopenia, while the other options are more general coagulation tests.

Source

American Society of Hematology guidelines
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Medium MEDICAL Confidence: high