Platelet Aggregation Test

This test is used to evaluate the ability of platelets to aggregate (clump together) in blood, a necessary part of the clotting process. The test assesses how well platelets function and is performed when a platelet dysfunction is suspected.

PREPARATION FOR TEST

No preparation or fasting is necessary.

  • Do not exercise 15-20 minutes before this test

  • Tell the healthcare worker doing the test if you are a smoker

NORMAL FINDINGS

  • Adults: >65% aggregation in response to adenosine diphosphate (ADP), arachidonic acid, collagen, epinephrine and ristocetin

  • Vary by the platelet agonist used.

Ranges for normal findings may vary among different laboratories and hospitals. You should always check with your doctor after having lab work or other tests done to discuss the meaning of your test results and whether your values are considered within normal limits.

MEANING OF TEST

Your caregiver will go over the test results with you and discuss the importance and meaning of your results, as well as treatment options and the need for additional tests if necessary.

OBTAINING THE TEST RESULTS

It is your responsibility to obtain your test results. Ask the lab or department performing the test when and how you will get your results.