Which of the following laboratory tests is used to diagnose and monitor von Willebrand disease?

A Prothrombin Time (PT)
B Partial Thromboplastin Time (PTT)
C Von Willebrand Factor Antigen Assay ✓
D Ristocetin Cofactor Assay

Explanation

The Von Willebrand Factor Antigen Assay is a laboratory test used to diagnose and monitor von Willebrand disease, which is a common inherited bleeding disorder caused by deficiency or dysfunction of von Willebrand factor.

Source

Hematology textbooks and research articles
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Easy MEDICAL Confidence: high