D-dimer test

Overview: What is a D-Dimer Test?

A D-dimer test is a blood test used to help diagnose blood clots. The test measures a protein, known as D-dimer, that is released when a clot breaks down in the body. The test can only detect elevated levels of D-dimer, which can be an indicator of deep vein thrombosis (DVT) or pulmonary embolism (PE).

Why is It Done?

The D-dimer test is typically used to help rule out the presence of a blood clot. This is important, as a blood clot can be deadly in some cases. If the results of the test are positive, then additional tests, such as an ultrasound or CT scan, may be needed to confirm the diagnosis.

Preparation

No special preparation is needed for a D-dimer test. Patients should tell the doctor about any medications they are taking, prior to the test.

Procedure

A blood sample is taken from a vein in the patient’s arm, and the sample is analyzed for D-dimer. The results of the test are usually available within a few hours.

Types

The D-dimer test is available as a clinical test and an automated test. The automated test is generally less expensive and more efficient than the clinical test, and is used more frequently.

Risks

The D-dimer test is a relatively low-risk procedure. There is a small risk of bleeding, swelling or infection at the site where the blood sample was taken.

Why is It Important?

The D-dimer test is an important tool in diagnosing potentially life-threatening blood clots. It is a quick, efficient and cost-effective way to help determine whether the patient needs further testing.

When is It Done?

The D-dimer test is typically done when the doctor suspects that a patient may have a blood clot. It can be used to help rule out the presence of a clot, or it can be used to assess the risk of recurrent clots in patients who have already had a blood clot.