D-dimer mass concentration (serum/plasma)

What Is D-Dimer?

D-dimer is a protein fragment created when blood clots dissolve naturally. Elevated levels may suggest recent clotting activity, such as deep vein thrombosis (DVT) or pulmonary embolism. Your doctor may order this test to evaluate symptoms like leg swelling, chest pain, or unexplained shortness of breath.

Why Might This Test Be Done?

A healthcare provider may order a D-dimer test if you have symptoms of blood clots (e.g., swelling, pain in legs or chest), a history of clotting disorders, or if you’re being evaluated for conditions like deep vein thrombosis (DVT) or pulmonary embolism. It’s also sometimes used in screening for certain cancers or inflammatory conditions.

How Is the Test Performed?

A blood sample is drawn from a vein, usually in your arm. The blood is sent to a lab where it’s analyzed for D-dimer levels using a sensitive test that detects the protein fragments. Results are typically available within a few hours.

What Do the Results Mean?

Results are not provided with specific reference ranges, as they depend on clinical context. Very high levels may indicate recent clotting, while very low levels may suggest no active clotting. Your doctor will interpret the result alongside your symptoms, medical history, and other test results.