Ristocetin Induced Platelet Aggregation


Sunquest Code:RAG  
Epic Code:LAB3170Epic Name:Ristocetin Induced Platelet Aggregation
Synonyms:Quantitative Ristocetin Aggregation; Platelet Function Tests; RIPA
Methodology:Aggregation of patient's platelets using Ristocetin at various concentrations on a Chronolog Platelet Aggregometer.
CPT Code:85576
Special Instructions:The patient must be on site for testing. Call lab (612-273-4797) to schedule.


Collection Instructions

Specimen:Blood
Collection Instructions:Performed by Coagulation Laboratory staff.


Processing and Shipping

Test Performed at or Referral Lab Special Coagulation  (UMMC-East Bank)


Interpretive

Reference Range:Interpretive report by Coagulation Laboratory physician.
Use:To differentiate von Willebrand subtypes 2A from 2B. Type 2A aggregates with only normal or high concentrations of Ristocetin (normal to HYPOresponsive). Type 2B aggregates with even low concentrations of Ristocetin (HYPERresponsive). Type 2B patients should not be treated with DDAVP. They may have a severe drop in their platelet count. This test is also part of a Platelet Aggregation workup.


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