The main contents of the blood test are: 1. routine blood tests to find out whether there is any infection and whether there is low hematocrit and anemia. 2. routine urine and stool tests to find out whether the stool is positive for occult blood or whether there is an increase in white blood cells and infection in the urine. 3. check liver function, kidney function, blood lipids and electrolytes to find out whether liver function is damaged, whether there is hepatitis or liver dysfunction, and whether there are abnormalities in kidney function, creatinine, urea nitrogen and electrolytes. 4. 4. Check tumor markers, hepatitis B and A, blood clotting function, etc. to get a basic understanding of the body’s condition.