A d-dimer test is a blood test that measures a substance that is released when a blood clot breaks up. Doctors order the d-dimer test, along with other lab tests and imaging scans, to help check for blood-clotting problems. A d-dimer test can also be used to check how well a treatment is working.
The test is also known as the fibrin degradation fragment test or the fragment d-dimer test.
Why It Is Done
Doctors use the d-dimer test when a person might have a dangerous blood-clotting problem. These problems include:
How To Prepare
No special preparation is required before having this test.
How It Is Done
The health professional drawing your blood will:
How It Feels
The blood sample is taken from a vein in your arm. An elastic band is wrapped around your upper arm. It may feel tight. You may feel nothing at all from the needle, or you may feel a quick sting or pinch.
There is very little chance of a problem from having a blood sample taken from a vein.
The d-dimer test measures the amount of a substance that is released when a blood clot breaks up.
The normal values listed here (called a reference range) are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.
What To Think About
D-dimer test results may be affected if the person being tested has rheumatoid arthritis, has had recent surgery or trauma, is on estrogen therapy, or is pregnant.
eMedicineHealth Medical Reference from Healthwise
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