| Diagnostic Criteria for Venous Duplex | |
|---|---|
| Normal | Abnormal |
| Complete coaptation of the vein walls with light probe pressure | Lack of complete vein compression |
| Absent intraluminal thrombus | Intraluminal echoes present (acute thrombus can be echolucent) |
| Colour flow fills the lumen completely | Decrease or absence of colour flow |
| Normal venous Doppler spontaneity, phasicity and augmentation | Abnormal venous Doppler spontaneity, phasicity or augmentation |
| No venous dilatation | Dilated or contracted veins noted |
'Size, G (2013). Inside Ultrasound Vascular Reference Guide. Inside Ultrasound, Incorporated' – Purchase Now
| Interpretation Criteria for Patency: All Veins |
|---|
| Complete coaptation of the vein walls with the ultrasound transducer. |
| Absence of visible intraluminal thrombus on B-mode image in transverse and longitudinal planes. |
| Normal venous Doppler (conventional or color) signals of spontaneity and phasicity. |
| Visualization of blood flow throughout the lumen with color Doppler. |
| Interpretation Criteria for Venous Thrombosis |
| Lack of complete compressibility of vein (beware: a normal femoral vein in adductor canal region may not compress). The split-screen image on the right demonstrates the appearance of the popliteal vein without, and with transducer compression. The vein does not compress in the right-side image. |
Daigle, R (2009). Techniques in noninvasive vascular diagnosis: An encyclopedia of vascular testing 3rd edition. Littleton, CO: Summer Publishing.