Proceeds from website advertising help sustain Lab Tests Online. AACC is a not-for-profit organization and does not endorse non-AACC products and services.

Platelet Function Tests

Print this article
Share this page:
Also known as: Platelet Aggregation Studies; PFT; Platelet Function Assay; PFA
Formal name: Platelet Function Tests

At a Glance

Why Get Tested?

To help determine the cause of or potential for excessive bleeding and/or to diagnose a platelet function disorder; to monitor and evaluate platelet function; to monitor the presence and effectiveness of anti-platelet medications

When to Get Tested?

When you bruise easily or experience excessive or prolonged bleeding; when you are taking medications that can alter platelet function; 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. However, do not stop taking your medications unless instructed to do so by your health care provider.