D-dimer (Plasma) – Fibrin Degradation Products

What Is D-Dimer Used For?

Doctors use D-dimer testing primarily to evaluate suspected blood clots. It can help determine if you have conditions like deep vein thrombosis (DVT) or pulmonary embolism (PE), where blood clots form in veins or the lungs. This test is often used alongside other tests or imaging to guide treatment decisions.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The blood is processed to separate plasma, where the D-dimer fragments are measured using a sensitive immunoassay method. The test is usually done quickly, often within a few hours of drawing the blood.

When Might You Need This Test?

Your doctor may recommend a D-dimer test if you have symptoms like swelling, pain, or shortness of breath that could suggest a blood clot. It’s also used in certain situations to help confirm or rule out conditions like DVT or PE, especially when other tests or imaging are inconclusive.

What Are the Possible Results?

A high level of D-dimer suggests recent clot formation and breakdown, which may indicate a clot-related condition. A low or undetectable level usually means no significant clotting activity is present. Results alone don’t diagnose a condition—they’re used alongside other tests or clinical findings.