Pathology: Blood or qi deficiency. This is seen in cases of deficiencies and failure of Qi and blood. It can also be seen in disharmonies of the even emotions, weakness in Yang Qi, internal damage to jing, and penetration of dampness.
Testing for venous blood clots. Venous blood clots may be detected in a variety of ways, though ultrasound is most commonly used. Occasionally, the patient's size and shape limit the ability for ultrasound to provide a definitive answer. Venography is an alternative test to look for a clot.
doctors order a d dimer test to determine if a person has a blood clotting problem which sometimes occurs with conditions such as deep vein thrombosis or a pulmonary embolism says webmd physicians use the test to evaluate the effectiveness of clotting therapies and to adjust the treatment regimen accordingly