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Laboratory Medicine

Test catalogue

Platelet Aggregation

Test Name

Platelet Aggregation

Blue Tube Specimen Type / Requirements

Container Type = Blue

Minimum Volume = 9:1 Ratio – Full Draw

Specimen handling

Collection Instructions: Collect blood into blue top vacutainers which contain 3.2% buffered sodium citrate. NOTE: The ratio of blood to anticoagulant is 9 parts blood to 1 part anticoagulant, therefore the blue top vacutainer (citrate) must be filled AT LEAST ¾ in total volume. Cut-off time for testing is 3:00 p.m. Specimens must be maintained at room temperature and transported immediately to the Special Coagulation lab, following phlebotomy. Haematology consult is required. Please call Special Coagulation at ext 5123 or the Haematologist on call. Write your initials, date and time of collection on the collection label.

Stability: Stable frozen at -20C for up to two weeks or -70C for up to six months

Transportation: Send sample to core lab as soon as posible.DO NOT SEND specimens via the pneumatic tube system. Specimens should be transported by porter and maintained at room temperature with minimal agitation . Specimens that cannot be tested within the suitable timeframe (within 2hrs of Collection) are to be double-spun and send frozen.

Laboratory Staff Instructions: Testing is to occur within 3 hours from the time of blood collection due to the lifespan of platelets Special care must be taken to ensure that specimens are not agitated. Specimens must remain in the upright position until time of testing.

Sample Rejection Criteria: Clotted sample, Grossly hemolyzed samples, Unlabeled or Not Sufficient Quantity Samples will be rejected. Transportation: via the pneumatic tube system is UNACCEPTABLE.

Required Documentation

Regular HIS order or Haematology requisition required.

Turnaround Time (TAT)

1 Day

Test Utilization

> 24Hrs

Reference Value

Normalized Ratio

See Interpretive report

Test Code



Platelet Function

Testing Location

SMH-Special Coagulation

Other information