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Platelet Function Tests

Also known as: Platelet aggregation studies; PFT; Platelet function assay; PFA
Formal name: Platelet Function Tests
Related tests: CBC; Blood smear; Platelet count; PT; PTT; Bone marrow biopsy; Coagulation factors; Von Willebrand factor (VWF)

At a Glance

Why Get Tested?

To help determine the cause of or potential for excessive bleeding, to monitor and evaluate platelet function, and to monitor the presence and effectiveness of antiplatelet medications

When to Get Tested?

When you are bruising easily or experiencing excessive bleeding, when you are taking medications that can alter platelet function, and prior to or during certain surgeries

Sample Required?

A blood sample drawn from a vein in your arm

Test Preparation Needed?

You may be instructed to refrain from taking drugs that can affect the results of these tests, such as aspirin, non-steroidal anti-inflammatory drugs (NSAIDs), or any over-the-counter medications that contain drugs such as these. The most common NSAIDs include ibuprofen, naproxen and COX-2 inhibitors.