Platelet Aggregation Test
Normal Values
The normal time it takes to cause clumping is temperature dependent and may vary from laboratory to laboratory. The shape of the vial is also important.
Response to the different "aggregation stimulators" can help to distinguish various platelet defects. In particular, the difference between the response to ristocetin and the other products is important, because ristocetin triggers aggregation through a different mechanism than the other products. The time and pattern of platelet aggregation also varies between stimulators.
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