The lab test used to evaluate the effectiveness of heparin therapy is used because it demonstrates the action of heparin in interfering with the conversion of:
a. prothrombin to fibrinogen c. prothrombin to thrombin
b. thrombin to thromboplastin d. proconvertin to proaccelerin
ANS: C
Feedback
A Incorrect: Prothrombin does not convert to fibrinogen.
B Incorrect: Thrombin does not convert to thromboplastin.
C Correct: The actual partial thromboplastin time measures how effectively heparin interferes with the conversion of prothrombin to thrombin.
D Incorrect: These two clotting factors are not affected by heparin.
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