Platelet Function Tests 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 from minor cuts, nose or gums, or excessive menstrual bleeding; when you are taking medications that can alter platelet function; prior to or during certain surgeries; if you have a family member with a history of excessive bleeding 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, anti-histamines, and certain antibiotics. The most common NSAIDs include ibupr...