Blood flow studies

Alternative names:

duplex/Doppler ultrasound

Normal values:

Greater than .9 A/B index (the Doppler or systolic pressure of the ankle divided by the pressure in the arm) is normal.

What abnormal results mean:

Less than .5 A/B is associated with:

• peripheral vascular disease
• deep venous thrombosis
• superficial thrombophlebitis
• communicating vein thrombophlebitis
• peripheral artery disease

Additional conditions under which the test may be performed:

• Raynaud's Phenomenon
• stroke secondary to carotid dissection