D-dimer is a biomarker of blood clotting. It is a small protein fragment that is produced when a blood clot breaks down in the body. The presence of D-dimer in the blood is an indicator of a current or recent clotting process.
D-dimer tests measure the amount of this protein fragment in the blood. A high or rising D-dimer level is usually a sign of an active clotting disorder or recent clotting event. Low levels of D-dimer usually indicate that there is no current clotting problem.
D-dimer tests are used to diagnose and monitor a variety of clotting disorders, such as deep vein thrombosis, pulmonary embolism, and stroke. They can also be used to evaluate the effectiveness of anticoagulant (blood-thinning) medicines.
In addition to diagnosing and monitoring clotting disorders, D-dimer tests can be used to rule out clotting disorders in the absence of other symptoms. This is especially useful in people with a history of clotting disorders, as it can help to identify any potential issues early.
In summary, D-dimer is a biomarker of blood clotting that is used to diagnose and monitor a variety of clotting disorders. It can also be used to rule out clotting disorders in the absence of other symptoms.