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.
UUHSC Testing OnlyUUHSC Testing Only

Specimen Required
Patient Preparation
Specimen must be collected at ARUP (500 Chipeta Way, Salt Lake City, UT). Call the Hemostasis/Thrombosis laboratory at (801) 583-2787 ext. 2151 to schedule specimen collection. Special arrangements for UUHSC In-Patients can be made by contacting the number above. Patient must fast from midnight until specimen is collected.  
Collect
Lt. blue (sodium citrate) AND lavender (EDTA) or pink (K2EDTA).  
Specimen Preparation
Transport 14 mL whole blood (lt. blue) AND 4 mL whole blood (EDTA) ((Min: 14 mL whole blood (lt. blue) AND 4 mL whole blood (EDTA)). Specimen must be received within one hour of draw.  
Storage/Transport Temperature
CRITICAL ROOM TEMPERATURE.   
Unacceptable Conditions
Specimens not collected at ARUP. Specimens that have been centrifuged or refrigerated.  
Remarks
 
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
A completed Patient History Form must be submitted and approved prior to specimen collection. The Patient History Form is available on the ARUP Web site or by contacting ARUP Client Services at (800) 522-2787.
CPT Code(s)
85576
Components
Component Test Code*Component Chart NameLOINC
2003383Ristocetin-Induced PlateletAgg High Dose55799-1
2003384Ristocetin-Induced Platelet Agg Low Dose55801-5
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, please click the sidebar link to access the Interface Map.
Aliases
  • RIPA