Tests of coagulation Flashcards
What is the normal PTT
25-32 seconds
what is the normal aPTT
12-14 seconds
What is the target INR for a patient in Warfarin
2-3 times control
What is the normal platelet count
150,000-300,000
__________ monitors platelet function but is rarely used in clinical practice
Bleeding time
Normal ACT is _________. It should exceed _______ before going to CPB
90-120 seconds
400 seconds
Factors must be reduced by more than _______ before a change in aPTT is observed.
30%
aPTT measures the time it take to form a clot using______, ____________ and __________.
phospholipid
calcium
an activator
Normal aPTT is?
25-32 seconds
What does the normal length of aPTT and PT tell you about the speed of the 2 coagulation pathways
Normal aPTT is longer than normal PT because the intrinsic pathway is slower than the extrinsic pathway.
PT measures the time it takes to form a clot using ___________ and ____________
Tissue factor and calcium
Factors must be reduced by more than ______ before a change in PT is observed?
30%
Normal INR in healthy patients is ________
Approximately 1
It compares patient’s PT to the standard mean PT
ACT should be measured ______ minutes after heparin and _______ minutes thereafter.
3 minutes and every 30 minutes thereafter
In large heparin doses, _______ is more accurate than PTT.
ACT
