Bleeding time

A blood pressure cuff is inflated around your upper arm. While the cuff is on your arm, the health care provider makes two small cuts on the lower arm. They are just deep enough to cause a tiny amount of bleeding.

The blood pressure cuff is immediately deflated. Blotting paper is touched to the cuts every 30 seconds until the bleeding stops. The provider records the time it takes for the cuts to stop bleeding.

Certain medicines can change blood test results.

• Tell your health care provider about all the medicines you take.
• Your provider will tell you if you need to temporarily stop taking any medicines before you have this test. This may include dextran and aspirin or other nonsteroidal anti-inflammatory drugs (NSAIDs).
• Do not stop or change your medicines without talking to your doctor first.

The tiny cuts are very shallow. Most people say it feels like a skin scratch.

This test helps diagnose bleeding problems.

Bleeding normally stops within 1 to 9 minutes. However, values may vary from lab to lab.

Longer-than-normal bleeding time may be due to:

• Blood vessel defect
• Platelet aggregation defect
• Thrombocytopenia (low platelet count)

There is a very slight risk of infection where the skin is cut.