Blood glucose monitoring is for diabetic patients, reflecting the blood glucose control by monitoring blood glucose at different time periods. Diabetic patients can also self-monitor their blood glucose at home, and the operation process is divided into the following steps: first take out the blood glucose meter, prepare the test paper into the blood glucose meter, disinfect one of their fingers with 75% alcohol, wait for the alcohol to dry, and then take out the blood glucose monitoring pen to tie their fingers. The first drop of blood should be wiped off with a clean cotton swab, put the second drop of blood into the test paper, and wait for the result of the blood glucose monitor, which is the complete process of blood glucose measurement. Blood glucose monitoring should reflect the control of blood glucose through the following blood glucose points: fasting blood glucose, two postprandial blood glucose, early morning blood glucose, and random blood glucose. Fasting blood glucose mainly reflects the overall control of blood glucose; two hours after meal blood glucose mainly evaluates the diet of diabetes or whether the treatment is effective; random blood glucose mainly measures blood glucose at any time when you are uncomfortable to help the doctor evaluate the situation at that time. 1-3 a.m. is the time when blood sugar is lowest in the human body, which can reflect whether there is hypoglycemia and whether treatment plan needs to be adjusted.