Criteria for Diagnosis of Budd-Chiari Syndrome

Clinical manifestations
Gradual onset of right upper quadrant abdominal pain, ascites, hepatomegaly
Chronic type: poor nutritional status, jaundice mild, lower extremity edema (for occlusion of retrohepatic vena cava by the hypertrophied caudate lobe), kidney failure, portal hypertension 
Rarely acute type: fulminant liver failure with massive liver necrosis and liver coma, severe coagulopathy, hypoglycemia

Laboratory tests
Serum transaminases, bilirubin, alkaline phosphatase: normal or mildly elevated
Serum albumin: may be decreased
Prothrombin time: may be mildly prolonged
Diagnosis of common associated hematological disorders (polycythemia rubra vera, essential thrombocytosis and antithrombin III deficiency)
Peripheral blood smear and bone marrow biopsy for myeloproliferative disease
Liver biopsy: centrilobular congestion and parenchyma necrosis.

Diagnostic tests
Angiography (gold standard of diagnosis), transfemoral or transjugular approach: spider web pattern of small hepatic vein.
Color-flow doppler ultrasonography
Computed tomographic scanning
Nuclear magnetic resonance