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.
The radiologic indications of a blood clot are considered as the most valid method of diagnosing most cases of blood clots, especially deep vein thrombosis. An ultrasound is the common used method that is easy and painless. Another option that is highly sensitive in picking up blood clots below the knee is venography.