A citrated blood sample is tested with the following results: • PT = 60.0 seconds
• APTT = 100.0 seconds
Pending further testing, the most probable reason for these results is not:
A) Factor VIII deficiency
B) Factor V deficiency
C) Factor II deficiency
D) Fibrinogen deficiency

Question

Quizplus · Accepted Answer

Factor VIII deficiency primarily affects the intrinsic pathway, which would prolong APTT but not PT significantly. PT is more reflective of the extrinsic and common pathways, where factors V, II, and fibrinogen play critical roles.

A Citrated Blood Sample Is Tested with the Following Results