Platelet Aggregation Test-Why am I having this test?

Platelets are specialized cells that help the blood clot. When you get a tissue injury like a cut, platelets gather and clump at the site of the injury to stop the bleeding. This process is called platelet aggregation.

You may have the platelet aggregation test:

• If you have symptoms of platelet dysfunction, such as excessive bleeding from minor cuts and scrapes.
• To monitor treatment of bleeding or platelet disorders.

What is being tested?

This test measures how long platelet aggregation takes.

What kind of sample is taken?

A blood sample is required for this test. It is usually collected by inserting a needle into a blood vessel or by sticking a finger with a small needle.

How do I prepare for this test?

Follow instructions from your health care provider about changing or stopping your regular medicines.

Tell a health care provider about:

• All medicines you are taking, including vitamins, herbs, eye drops, creams, and over-the-counter medicines.
• Any blood disorders you have.
• Any medical conditions you have, especially:
  • Jaundice.
  • High cholesterol.
  • Hemolysis.
• Whether you are pregnant or may be pregnant.

How are the results reported?

Your test results will be reported as a value that indicates how long it takes your blood to clot. Your health care provider will compare your results to normal ranges that were established after testing a large group of people (reference ranges). Reference ranges vary among labs and hospitals, depending on which technique is used to process your blood sample.

What do the results mean?

A result that is within the reference range is considered normal. This may mean that your blood clots at a normal rate.

If your results are higher than the reference range, your blood may clot too quickly. If your result is below the reference range, your blood may clot too slowly. Talk with your health care provider about what your results mean. Abnormal results may be a sign that you have a platelet disorder.

Questions to ask your health care provider

Ask your health care provider, or the department that is doing the test:

• When will my results be ready?
• How will I get my results?
• What are my treatment options?
• What other tests do I need?
• What are my next steps?

Summary

• Platelets are specialized cells that help the blood clot.
• You may have the platelet aggregation test if you have symptoms of platelet dysfunction, like excessive bleeding.
• A result that is within the reference range is considered normal. Results above or below the reference range may indicate a platelet disorder.