Platelet Function Test Flashcards
Obsolete test; reflects the platelets function
Bleeding time
Provides an estimate of the integrity of the platelet plug
Bleeding time
Measures the interaction between the capillaries and platelets
Bleeding time
An infrequently performed _______ of platelet adhesion and aggregation on locally injured vascular sub endothelium
In vivo measurements
Method uses a lancet to make small, controlled puncture wound
Dukes Method
Reference interval of Dukes Method
2- 9 minutes
A blood pressure cuff is inflated at 40 mmhg
Standardized/ modified Ivy method
A calibrated spring loaded lancet is trigger on the __________ few inches distal to the ____________
Volar surface of forearm
Antecubital crease
How many incision made in standardized method
2
Reference interval for modified ivy method
2-9 mins
Degree of clot retraction is DIRECTLY PROPORTIONAL to
Number of platelets
Degree of clot retraction is INVERSELY PROPORTIONAL to
Hematocrit and fibrinogen
Evaluates how well platelets keep the clot adhered to the side of specimen tube
Clot retraction
Top tube used in clot retraction
Red tube (whole blood)
Examine clot in clot retraction in
1, 2, 4 and 24
Happens after 30 mins in clot retraction
Shrinks
Remains serum after clot forms
40-60%
screening test for dengue
capillary fragility test
capillary fragility test is known as
Rumpel-Leede Capillary Fragility Test or Tourniquet Test
A blood pressure cuff is applied and inflated to a point between the systolic and diastolic blood pressures for 5 minutes
capillary fragility test
Results in Capillary Fragility Test
10 or more petechiae per square inch
dengue hemorrhagic fever
20 or more petechiae per square inch
Capillary Fragility test has high specificity
false
confirmatory test for dengue fever
Ns1Ag
