Tourniquet
Test - 1
Function:
Measures primary hemostasis,
specifically capillary fragility
Principle of test:
Pressure cuff on upper arm is set ½
way between systolic
and diastolic pressure(>80 but <100) for 5 minutes.
The number of petechiae (small red
dots caused by capillary bed leakage) in an area the size of a quarter are counted.
Normal range:
0 to occasional