Buga syndrome is a clinical syndrome of impaired organ tissue stasis caused by partial or complete obstruction of the hepatic veins or (and) the inferior vena cava of the hepatic segment, resulting in impaired venous blood return. So what are the tests for hepatic venous return disorders? Here is a brief introduction for you. 1.Imaging methods 1.Ultrasound examination: the examination content: (1) the direction of blood flow in hepatic vein and inferior vena cava; (2) whether there is septum or lumen narrowing or occlusion in the proximal segment of inferior vena cava and hepatic vein opening; (3) whether there is traffic branch between hepatic vein and the direction of blood flow in traffic branch 2.CT or MR examination: it is recommended to scan and enhance the liver, and to perform three-dimensional reorganization of hepatic vein and inferior vena cava after enhancement scan. 3.Angiography: Angiography is the gold standard for the diagnosis of BCS and the basis for interventional treatment. (1) Inferior vena cava angiography: unidirectional or bidirectional angiography through percutaneous puncture of femoral vein and/or jugular vein; (2) Hepatic venography: retrograde cannulation through percutaneous puncture of jugular vein or femoral vein, and percutaneous transhepatic puncture is recommended when retrograde cannulation fails. Inferior vena cava angiography for purely diagnostic purposes is not recommended. II. Laboratory tests Liver puncture biopsy, which is of great value in the diagnosis of hepatic venous return disorders. Central zone bruising of the hepatic lobules, atrophy, necrosis and fibrosis of hepatocytes are characteristic histopathological changes of hepatic venous return disorders.