clotting screen Flashcards
1
Q
What does PT stand for?
A
prothrombin time
2
Q
What does INR stand for?
A
International normalised ratio
3
Q
What is the formula to calculate INR?
A
patient PT/ reference PT
4
Q
what is a normal INR value?
A
0.8-1.2
5
Q
what is a normal INR value on warfarin?
A
2-3
6
Q
why may INR be raised?
A
- Anticoagulants
- liver disease
- Vit k deficiency
- DIC
7
Q
What does APTT stand for?
A
activated thromboplastin time
8
Q
what is the coagulation speed through intrinsic pathways?
A
35-45s
9
Q
what is the coagulation speed through intrinsic pathways on heparin?
A
60-80s
10
Q
what is APTT affected by?
A
- Haemophilia A
- Haemophilia B
- VWF disease
( all of these things raise APTT but have a normal PT)
