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Bleeding time

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Blood clot test

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Bleeding time

Definition:

This is a test that measures the speed at which small blood vessels close off to stop bleeding (the condition of the blood vessels) and platelet function.

How the test is performed:

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A blood pressure cuff is placed on the upper arm and inflated. Two incisions are made on the lower arm. These are about 10 mm (less than 1/2 inch) long and 1 mm deep (just deep enough to cause minimal bleeding).

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

How to prepare for the test:

Certain medications can interfere with platelet function and therefore may alter test results. Always make sure to tell your doctor what medications you are taking, even over-the-counter preparations.

Your health care provider may ask you to discontinue these medications several days prior to the test. Never discontinue medication without consulting your health care provider.

For infants and children:

The preparation you can provide for this test depends on your child's age and experience. For specific information regarding how you can prepare your child, see the following:

• Infant test or procedure preparation (birth to 1 year)
• Toddler test or procedure preparation (1 to 3 years)
• Preschooler test or procedure preparation (3 to 6 years)
• Schoolage test or procedure preparation (6 to 12 years)
• Adolescent test or procedure preparation (12 to 18 years)

How the test will feel:

The incisions are very shallow and should feel like scratches.

Why the test is performed:

This test is useful for detecting bleeding problems.

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