1 day

Specimen must be collected at OHSU and by appointment only. Call Lab Client Services at 503-494-7383 to schedule. Appointments can be scheduled Tuesday and Thursday, 9:00 am to 12:00 pm, at least 1 hour apart and no more than 3 per day.

Four full 2.7 mL whole blood LIGHT BLUE top (3.2% sodium citrate) tubes AND one 3 mL whole blood LAVENDER top (EDTA) tube. Do NOT send in pneumatic tube system. Do NOT spin. Stability is 3 hours at room temperature.

Avoid aspirin for 10 days and non-steroidal anti-inflammatories for at least 2 days prior to test. Fasting samples are preferred as food interferences are possible.

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.

Three full adult-sized 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.

This test is to screen for specific hereditary and acquired platelet functional abnormalities such as rare congenital disorders (Glanzmann's thrombasthenia and Bernard-Soulier syndrome).

Aggregation
Plt Agg