RIPA (Ristocetin Induced Platelet Aggregation)
|Further differentiate Type 2 VWD, specifically to confirm Type 2B VWD
|Platelets are agglutinated in vitro by adding 3 concentrations (1.5, 1.0 or 0.5 mg/mL) of ristocetin to platelet rich plasma which is stirred continually. The process is measured spectrophotometrically and the rate and degree of aggregation (clearing of the turbid solution) is plotted by a recorder.
|Appointment required. It will be drawn at Bloodworks Northwest. Call Hemostasis Lab at 206-689-6594 to schedule an appointment.
|RFT- Hemostasis Reference Laboratory
|Monday – Friday
|Turn around Time (analytic time)
|Same day as scheduled visit
|Fax number required to receive report