Diagnostic Tests for Evaluating Inferior Vena Cava (IVC) Issues

First-Line Imaging: Ultrasound

The American College of Radiology recommends duplex venous ultrasonography as the first-line imaging modality for initial evaluation of the IVC due to its non-invasiveness, lack of need for contrast agents, bedside availability, and lower cost 1, 2
Ultrasound allows for both analysis of venous compressibility and Doppler imaging of venous blood flow, with assessment of venous compressibility considered more definitive than flow analysis 1

The National Comprehensive Cancer Network recommends contrast-enhanced CT (CT venography) as a second-line imaging option, which is as accurate as ultrasonography in diagnosing femoropopliteal DVT and provides excellent imaging of large pelvic veins and the IVC 1, 3
CT venography can identify stenosis, occlusion, venous atresia, and collaterals, and allows for direct imaging of the IVC immediately after CT of pulmonary arteries without additional contrast 2, 4
The American College of Radiology recommends MR venography (MRV) as a second-line imaging option, which provides sensitive and specific evaluation of the pelvic veins and IVC without nephrotoxic contrast 1, 2
MRV can show additional details such as webs, trabeculations, and vein wall thickening, and is helpful for differential diagnosis of intracardiac masses 2, 5

The American College of Radiology recommends imaging of the IVC with CT venogram, MR venography, or ultrasound prior to IVC filter retrieval 3, 7
Venography is still valuable when performed in conjunction with pharmacomechanical thrombectomy/thrombolysis, and is typically performed at the time of IVC filter retrieval to assess for filter-associated thrombus and caval injury 1, 6, 3, 7

The National Comprehensive Cancer Network advises against relying solely on ultrasound for complete IVC assessment, especially for central portions 1