When measuring finger blood glucose due to alcohol not dried, unclean fingers, irregular operation, etc., the second drop of blood is usually more accurate, and if the operation is standardized and there is no influence of other factors, the first drop of blood will not have much effect on the test results. In fact, the first drop of blood and the second drop of blood are not clearly defined, the main reason is that when measuring blood glucose at the tip of the finger you need to use alcohol cotton balls to sterilize, when sterilized with alcohol, the first drop of blood may be mixed with the residual alcohol, resulting in the test results are affected, may make the blood glucose results low, so the second drop of blood is generally chosen to be more accurate in the measurement of blood glucose. In addition, some people who do not wash their hands before lancing or who have been in contact with sugar-containing substances may also bias the results of the first drop of blood, which may result in a high blood glucose measurement. If the operation is standardized, the finger is clean and hygienic, and the finger is sterilized with rubbing alcohol, then wait for a while for the alcohol to dry before lancing the needle and taking the blood test, the first drop of blood will not usually have a great influence on the test result. For diabetic patients, their own finger blood glucose measurement at home to facilitate the monitoring of blood glucose changes, it is also best to intermittently go to the hospital to review the venous blood glucose, venous blood glucose is more accurate, more conducive to the timely adjustment of glucose-lowering drugs. Diabetic patients found blood sugar abnormalities should be timely to the hospital, under the guidance of the doctor standardized treatment.