Before discharge, blood is also drawn to check the recovery of the disease, and whether the indicators meet the indications for discharge. Including blood routine, liver and kidney function, bilirubin, blood glucose, amylase, lipids and so on, different diseases and blood test items are different. 1. Blood routine: according to blood routine, we can check whether the patient has recovered from anemia, bacterial infection, viral infection, etc., whether the blood picture is normal, and whether there is any bleeding tendency. 2. Liver and kidney function: according to the patient’s serum check alkaline phosphatase, alanine aminotransferase, blood creatinine, uric acid and other values to determine the patient’s liver and kidney function recovery. 3. Bilirubin: total bilirubin, direct bilirubin and total bile acid can be examined through the patient’s serum to determine the recovery of cholecystitis, jaundice and tumor. 4. blood glucose: blood can be drawn to check the patient’s blood glucose, glucose tolerance, glycated hemoglobin and other recovery conditions. 5. Amylase: The level of amylase value can be checked by blood sampling to assist in diagnosing the recovery of acute and chronic pancreatitis. 6. Lipids: the patient’s recovery of blood lipids can be checked by serum examination of triglycerides, high-density lipoprotein and low-density lipoprotein. Blood sampling before discharge is to check the above items and other items, to understand the patient’s recovery, whether the patient can be discharged from the hospital, and to guide the post-discharge treatment and rehabilitation exercise. The items to be checked vary according to the patient’s condition, so it is necessary to choose the appropriate items for blood sampling under the guidance of the physician.