Coagulation diagnostics Flashcards
1
Q
Prothrombin time (PT)
A
- time it takes plasma to clot when exposed to tissue factor
- assess extrinsic
- measures effectiveness of warfarin
- normal= 11-13
2
Q
INR therapeutic level
A
2-3 seconds
3
Q
aPTT
A
-measures the time it takes plasma to clot when exposed to substances that activate contact factors
- assesses intrinsic
- evaluates heparin
WNL: 25-38 seconds
-can shift so heparin XA may be standard
4
Q
normal platelet count
A
150,000-400,000