Fasting during the blood test can exclude the influence of food factors and reflect the real situation of the components in human blood, making the test results more accurate.
When the body is in a relatively basic metabolic state during fasting, the components in the blood can maintain a certain stable state, which can more effectively measure the situation of various indicators in the blood.
However, if the blood test is not performed on an empty stomach, for example, if a large amount of fatty food is eaten before the blood draw, a large number of celiac particles will be quickly absorbed into the blood after the food is digested, and the blood lipids measured at this time are on the high side, which will deviate from the real results.
And if you eat a lot of sweets before blood sampling, then it may affect the blood glucose test results; eating high protein food can cause inaccurate blood urea and uric acid measurement results; drinking too much water can increase blood volume, affecting liver and kidney function, ionization and other test results.
To summarize, fasting is necessary for blood test. Eight hours before the blood test, you can not eat, can not eat high protein, spicy, greasy food, not to drink alcohol, also can not drink a lot of water, to ensure enough sleep, do not do strenuous exercise, so as not to affect the accuracy of the results of the blood test.