A 25-YO experienced chronic soft tissue bleeding and poor wound healing. His PT, PTT, and PLT count were normal. What follow-up assay is indicated?

Primary tabs

Platelet aggregometry
24% (26 votes)
Factor VIII and IX assay
12% (13 votes)
Factor XIII assay
39% (43 votes)
VWD profile
25% (28 votes)
Total votes: 110