D-dimer quantification is a blood monitoring tool used to observe the presence or absence of thrombosis in the body. D-dimer quantification is also one of the most important tools for assessing the effectiveness of thrombosis treatment. D-dimer is a breakdown of the blood clotting process after the body’s coagulation system is activated. D-dimer is also present in the body in normal conditions, but it disappears quickly. When deep vein thrombosis occurs in the body, the level of D-dimer increases dramatically. Quantitative D-dimer testing can also be used to evaluate the treatment of patients with blood clots. To treat blood clots, heparin anticoagulation, aspirin antiplatelet and urokinase thrombolysis are often used. This process results in a rapid rise in D-dimer, so D-dimer quantitative testing can be used to evaluate thrombolytic therapy. If the quantitative D-dimer test is abnormal, it is important to follow up with the vascular surgery department at the hospital.