To find out if the liver is normal, blood tests should be performed to see if the liver function is normal, and liver imaging tests should be performed to see if there are any structural abnormalities in the liver. The most common indicators of liver function are aminotransferases, bilirubin and albumin levels. Elevated levels of aminotransferases or bilirubin, which are higher than the normal values, mean that the liver is not functioning well, and lower than normal levels of albumin are also indicative of poor liver function. Hepatitis B virus and Hepatitis C virus infections can also be detected in the blood. Even if the liver function indexes are normal, it does not mean that there is no problem with the liver. Imaging tests such as ultrasound, CT or MRI should also be performed to see if there is any abnormality in the structure of the liver, because liver function tests may be normal in the early stage of cirrhosis, liver cancer and other cases where there is an abnormal structure in the liver. In conclusion, the liver is an organ with strong compensatory function, and when indicators such as aminotransferase and bilirubin are abnormal, it is often a sign that the liver damage is already very serious. To clarify whether the liver is normal or not as early as possible, comprehensive examinations including blood and imaging should be conducted.