When taking blood for three antibodies, liver function, renal function, biochemical examination, blood sugar test, glucose tolerance test and blood serological examination, it is required to take blood tests on an empty stomach in the morning.
This is because-
1) If the method used for each test is different, the normal value will be different. Because the body is in a relatively stable basal metabolic state on an empty stomach, the influence of factors such as diet can be ruled out, so an empty stomach blood test can reflect the real situation in human blood.
2) Avoid the influence of eating a variety of foods on some components in the blood. After eating, food is chewed and digested by the mouth, digested and absorbed by the gastrointestinal tract, and then transported to various tissues and organs by blood. Therefore, some ingredients in food enter the blood, which will increase the concentration of some ingredients in the blood, thus affecting the accuracy of the test results.
3) If you eat something before the blood test in the morning, a large number of chylous particles produced after food digestion will make the plasma milky white and become "turbid", which is called "fatty blood" in medicine. Because many blood biochemical tests are judged by the color changes of the samples submitted for inspection, it is difficult for inspectors to distinguish whether the blood is turbid, especially when measuring blood lipids, "excessive blood lipids" will affect the accuracy of the results.
4) Early morning examination can also avoid the influence of labor, strenuous exercise, mental excitement and other factors on the concentration of various chemical components in blood.
5) draw blood on an empty stomach in the morning, so that there is a unified blood drawing time and premise for many tests before and after, thus making the results of each test more comparable and convenient for statistical analysis.
In order to accurately judge and eliminate the air bubble interference caused by eating in the body, an empty stomach examination is required before eating.