Making the Diagnosis
To diagnose superficial thrombophlebitis, doctors will take a medical history (asking about symptoms) and do a physical examination. As well, an ultrasound of the suspected veins may be done.
For DVT, doctors look for signs of swelling and enlargement of the calf (due to swollen leg veins). A diagnosis of DVT is usually confirmed by X-ray using radiopaque dye or with a Doppler test. This is an ultrasound test that detects differences in echoes or sounds made by blood flow in the obstructed veins. Doppler ultrasound can easily detect the presence of blood clots in deep veins. Blood tests may also be performed to check for certain substances that are increased when a blood clot is present.