Epidemiological findings show that there are about 93 million people with chronic hepatitis B virus (HBV) infection in China, including about 20 million cases of chronic hepatitis B (“slow hepatitis B”), and chronic HBV infection accounts for about 50% of all cases of hepatocellular carcinoma and almost all cases in childhood worldwide. HBV can cause hepatocellular carcinoma without cirrhosis, but the majority (70%-80%) of patients with HBV-related hepatocellular carcinoma have cirrhosis, so slow hepatitis B and end-stage liver disease have been a serious threat to people’s health; at the same time, the incidence of fatty liver is as high as 20% in some urban populations in China, and with the improvement of diagnostic technology, autoimmune liver diseases and other diseases are also With the improvement of diagnostic technology, diseases such as autoimmune liver disease are becoming more and more recognized, so liver health is also getting more widespread attention. So, what are the functions of the liver? What are some of the routine tests that can help us check the health of the liver? The important role of the liver For the human body, the liver, like the heart, is an important pillar that supports our life building and is the “integrated factory” of the human body, carrying out various energy metabolism and chemical reactions at all times. Its main physiological functions include: metabolism, detoxification and immune function. First of all, the food that people consume every day needs to undergo important chemical changes in the liver, and the synthesis and metabolism of proteins, fats, sugars and vitamins in food is the main source of energy for all organs of the body. Secondly, the liver is the largest detoxification organ of the human body, and “how the body detoxifies” is always a hot topic, so we should pay more attention to the working status of the liver; because the human body needs the liver to detoxify alcohol, food that contains toxins in itself, and food that produces some toxins after digestion and metabolism. Therefore, we say that protecting the liver and maintaining its normal function is the true way to detoxify the body. Finally, the liver is also the largest defense system in the body, able to protect the body’s health by swallowing, isolating and eliminating invading and endogenous pathogens. Herein lies the mystery of why people with poor liver function are more likely to be associated with many diseases. Important tests related to liver diseases 1. Routine tests: liver and kidney function, blood routine, methemoglobin, abdominal ultrasound; 2. People with fatty liver: blood lipids, blood glucose, glycosylated hemoglobin, insulin, blood viscosity, carotid ultrasound, etc.; 3. People with viral hepatitis B: hepatitis B virus markers, hepatitis B virus DNA quantification; 4. People with autoimmune liver disease: antinuclear antibody quantification, double-stranded DNA 5.Population with liver tumor: methemoglobin and heteroplasm, CA199, carcinoembryonic antigen, etc. 6.Liver damage of unknown cause should be further investigated by abdominal CT or MRI (plain scan + enhancement), etc. Patients with chronic hepatitis B and C, regardless of whether they have clinical symptoms, should go to the liver department of a regular hospital every six months to a year for liver function, viral markers, alpha-fetoprotein and imaging, etc. Regular and timely checkups will help to observe changes and prevent disease progression. At the same time, alcohol should be avoided, light diet, and spicy and stimulating foods and health care products and drugs that may be hepatotoxic should not be consumed. In addition, any drug is a double-edged sword, for health care products, nutrition products should be taken according to their own situation under the guidance of doctors and other professionals in moderation, do not take a variety of, large quantities, long-term. For chronic diseases, long-term medication should be taken strictly in accordance with medical advice, the application of drugs with certain liver damage or patients with underlying liver disease should be regularly reviewed liver function, and according to the specific circumstances to try to choose a drug with little liver damage.