Ristocetin Induced Platelet Aggregation
Orderable EAP code:
Billable EAP Codes:
CPT Codes:
Lab Section:
Turnaround Time:
1 day
Test Schedule:
Advance notice required. Call 503-494-7383 to schedule. Performed Monday through Friday, 8:30 AM to 12:00 PM with preference for Tuesday/Wednesday.
Specimen Requirements:
Two full 2.7 mL LIGHT BLUE top tubes, 3.2% sodium citrate, AND one 3 mL LAVENDER (EDTA) top whole blood tube. Do NOT send in pneumatic tube system. Do NOT spin. Stability is 3 hours at room temperature.
Fasting samples preferred. Rarely, food interferences are possible. Avoid aspirin for 7 days prior to test and non-steroidal anti-inflammatories at least 2 days before the test. Schedule with Client Services, 503-494-7383, no more than 2 per day, preferred Tuesday and Wednesday before noon.
Draw volume is critical due to the liquid anticoagulant. Allow tubes to fill by vacuum.
• Tubes with rubber stopper: fill to line on label.
• Tubes with plastic (Hemogard) cap: the fill level is above the top of the label.
• Syringe: do not remove the vacutainer stopper. Insert the needle through the stopper and allow the tube to fill by vacuum. Do not overfill the vacutainer.
• Pediatric tubes have no vacuum. Remove the cap and add blood to the 1.3 mL mark. Do not overfill.
OHSU clinics must cab specimen to the H&T Lab, Dillehunt Hall, Room 3050 if processing is delayed or not possible on site. A phone call is helpful to alert the lab at 503-494-8445.
Detailed specimen collection and processing instructions are located under Lab Sections and then the Hemostasis and Thrombosis (Opens in a new window) section.
Pediatric Specimen Requirements:
Two full adult size 2.7 mL LIGHT BLUE top tubes, 3.2% sodium citrate, AND one PEDIATRIC LAVENDER top tube. Do NOT send in pneumatic tube system. Do NOT spin. Stability is 3 hours at room temperature.
For pediatric patients requiring multiple coagulation tests, please call 503-494-7383 regarding draw volumes.