D-dimer (serum/plasma, quantitative immunoassay)

What Is D-Dimer Used For?

D-dimer is primarily used to evaluate conditions involving blood clots, such as deep vein thrombosis (DVT) or pulmonary embolism. It can also support the diagnosis of other clotting disorders or help rule out bleeding complications in certain situations.

How Is the Test Performed?

A small blood sample is drawn from a vein, usually in your arm. The blood is processed to separate the serum or plasma, where the D-dimer levels are measured using an immunoassay method. This test is typically done quickly and can be part of a routine blood workup.

When Might You Need This Test?

Your healthcare provider may recommend a D-dimer test if you have symptoms like swelling, pain in your legs (possible DVT), chest pain or shortness of breath (possible pulmonary embolism), or if you have a history of clotting disorders. It may also be used in certain surgical or medical settings to monitor bleeding risks.

What Do My Results Mean?

High levels of D-dimer may suggest recent clot formation or clot-dissolving activity, while very low levels are usually normal. However, results alone cannot diagnose a clot or bleeding disorder without clinical correlation. Your doctor will interpret the results in the context of your symptoms and medical history.