If you have lupus or another autoimmune disease, and the test results are negative, your healthcare provider may want to repeat the test at a later date to determine if the anticoagulant antibodies have begun to develop. Normal values range from 20 to 39 GPL or MPL units.How to diagnose a DVT?
The most common tests used to diagnose DVT are: Ultrasound. This is the most common test for diagnosing deep vein blood clots. A D-dimer test. This test measures a substance in the blood that’s released when a blood clot dissolves. Venography. This test is used if ultrasound doesn’t provide a clear diagnosis.Why is a positive D-dimer is not always a blood clot?
Why a Positive D-Dimer Is Not Always a Blood Clot. A blood clot causes a breakdown product called D-dimer . A negative blood result means you don't have a pulmonary embolism. But with increasing age comes an increased likelihood of a positive result, even if there are no blood clots.