Characteristics of normal vein on USG Doppler:
-
Anechoic
-
Compressible
-
Augmentation sign +ve
-
Monophasic flow
-
Respiratory phasicity +ve.
Characteristics of venous flow in DVT:
-
Hypoechoic with mobile echoes (of thrombus)
-
Non-compressible
-
Augmentation sign -ve
-
Monophasic flow with ABSENT respiratory phasicity (in the distal bv)
-
Absent flow altogether in the involved vein.