ARUP's Laboratory Test Directory

Ristocetin-Induced Platelet Aggregation : 2003382
[ image for: Time Sensitive]
Time Sensitive
[ image for: UUHSC Testing Only]
UUHSC Testing Only


Mnemonic: RIPA

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.
Methodology: Qualitative Aggregation
Performed: Tue
Reported: 1-2 days
Specimen Required: Patient Prep: 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.

Remarks: Include list of current medications and most recent platelet count.

Unacceptable Conditions: Specimens not collected at ARUP's Red Butte Clinic. Specimens that have been centrifuged or refrigerated.

Stability (collection to initiation of testing): 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

CPT Code(s): 85576