At which level is the venous puncture performed for introducing contrast in venography to assess for DVT?

The venous puncture for introducing contrast in venography to assess for Deep Vein Thrombosis (DVT) is typically performed at the level of the common femoral vein (CFV). This is primarily because the CFV provides a central access point that allows for adequate visualization of deeper venous structures in the pelvic region and proximal lower extremities.

The common femoral vein is conveniently located near the inguinal ligament and has a larger diameter compared to peripheral veins, making it easier to achieve access and infusion of contrast. Accessing the CFV also helps ensure that the contrast medium can flow freely through the major venous pathways, offering a comprehensive assessment of potential thrombus formation.

While the other options, such as the popliteal vein or dorsal vein of the foot, are potential sites for venous access, they do not provide the same level of comprehensive visualization for DVT assessment as the CFV. Puncture at these sites may lead to inadequate imaging of the larger and more clinically significant veins in the area of interest.