1. Serum bilirubin is variably reasonably or markedly elevated.
2. Serum AST (SGOT)&ALT (SGPT) are elevated (20-400 U/L),(normal 35 U/L)
3. The prothrombin time is enlarged in severe cases.
4. Serum HBsAG & HBcAG test may be positive (in hepatitis B)
5. Ultrasonogram of hepatobiliary system.
6. Liver biopsy (if needed) is confirmatory-usually not necessary
7. Blood count -lymphocytes
8. Serological test may be useful
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