The D-dimer test is used to test for a protein that helps with blood clotting. Doctors use the D-dimer test to check for blood clotting problems and to see how well a treatment is working, according to WebMD.
The test is a easy procedure in which a medical professional draws the patient's blood. The test does not involve special preparation and only takes a few minutes, but the results might take a while to process. The D-dimer is often used to test for deep vein thrombosis, pulmonary embolism and disseminated intravascular coagulation. If blood is clotting properly, a low or normal level of the D-dimer protein is released, which is then found in the blood draw, notes WebMD.