Ristocetin-Induced Platelet Aggregation
2003382
 
Ordering Recommendation
Not an initial test in the diagnosis of von Willebrand disease (vWD). Order in consultation with a coagulation specialist to distinguish between type 2 subtypes in patients diagnosed with vWD.
Mnemonic
RIPA
Methodology
Qualitative Aggregation
Performed
Tue
Reported
1-2 days
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
Patient must fast from midnight until specimen is drawn in a.m. Patient may drink water.  
Collect
Hemostasis/Thrombosis laboratory must be called at (801) 583-2787 extension 2151 to schedule testing before specimen is drawn. Lt. blue (sodium citrate). AND lavender (EDTA) or pink (K2EDTA).  
Specimen Preparation
Specimen must be received within one hour of draw. Transport 15 mL whole blood (lt. blue) AND 5 mL whole blood (EDTA). ((Min: 15 mL whole blood (lt. blue) AND 5 mL whole blood (EDTA)).  
Storage/Transport Temperature
CRITICAL ROOM TEMPERATURE.  
Unacceptable Conditions
Specimens not collected at ARUP's Red Butte Clinic. Specimens that have been centrifuged or refrigerated.  
Remarks
Include list of current medications and most recent platelet count.  
Stability
Ambient: 1 hour; Refrigerated: Unacceptable; Frozen: Unacceptable  
Reference Interval
Effective April 18, 2011
Ristocetin-​Induced Platelet Aggregation High Dose Normal
Ristocetin-​Induced Platelet Aggregation Low Dose Normal
Interpretive Data
Note
CPT Code(s)
85576
Components
Component Test Code*Component Chart Name
2003383Ristocetin-Induced PlateletAgg High Dose
2003384Ristocetin-Induced Platelet Agg Low Dose
2003385Ristocetin-Induced Platelet Agg Interp
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, contact interface support at interface.support@aruplab.com.
Cross References
  • RIPA