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.
Doctors use the d-dimer test when a person might have a dangerous blood-clotting problem. These problems include:
No special preparation is required before having this test.
The health professional drawing your blood will:
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.
Less than 250 micrograms per liter (mcg/L)
Less than 1.37 nanomoles per liter (nmol/L)
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.
Fischbach F, Dunning MB III (2015). A Manual of Laboratory and Diagnostic Tests, 9th ed. Philadelphia: Wolters Kluwer Health.
Other Works Consulted
Fischbach F, Dunning MB III (2015). A Manual of Laboratory and Diagnostic Tests, 9th ed. Philadelphia: Wolters Kluwer Health. Pagana KD, Pagana TJ (2014). Mosby's Manual of Diagnostic and Laboratory Tests, 5th ed. St. Louis: Mosby.
ByHealthwise Staff Primary Medical Reviewer E. Gregory Thompson, MD - Internal Medicine Specialist Medical Reviewer Martin J. Gabica, MD - Family Medicine
Current as ofOctober 5, 2017
Current as of:
October 5, 2017
E. Gregory Thompson, MD - Internal Medicine & Martin J. Gabica, MD - Family Medicine
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