A Rare Cause of Acquired Factor X Deficiency in an 87-Year-Old Female

Table 1

Coagulation factors, prothrombin time, and partial thromboplastin time activities before and upon mixing studies.

	Laboratory values	Laboratory values upon mixing
Prothrombin time	15.6 seconds (9.1–12)	10.2 seconds
Partial thromboplastin time	36 seconds (24–33)	28 seconds
International normalized ratio	1.5 (0.9–1.2)
von Willebrand factor antigen	153% (50–200)
von Willebrand factor activity	119% (50–200)
Factor II activity	85% (50–154)
Factor VII activity	110% (51–186)
Factor VIII activity	115% (56–140)
Factor IX activity	83% (60–177)
Factor X activity	15% (76–183)	83%
Factor XI activity	83% (60–150)
Factor XII activity	102% (50–150)
Factor XIII activity	124%