Medical Encyclopedia:
Venous Insufficiency: Diagnosis
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There are several techniques used to diagnose venous disease. Electrical impedance plethysmography (IPG) provides a functional evaluation for outflow obstruction ultrasound (a machine that transmits sound waves) studies can visualize the venous system in certain areas. Another technique called duplex scanning can measure velocity within a vein.
— Laith Farid Gulli, M.D.
