The impact of eating on blood tests

Blood tests are a very common method of examination in our daily life. When doing blood tests, you must be aware of some precautions, such as fasting for more than 8 hours to ensure the accuracy of the results of the blood test. In addition, you must also understand some precautions before blood collection, such as try not to exercise too much, not eat too much food containing vitamins, etc. Let's take a look at this aspect.

Effects of eating on blood tests

Generally speaking, fasting means having an empty stomach without eating. There are several situations where you may encounter problems with fasting, such as when the laboratory requires you to fast, after getting up in the morning, you don't eat breakfast, drink little or no water, don't do morning exercise, and go to the hospital with a calm mind to wait for blood collection. Can accurately reflect the condition. Generally, if you eat, the test results may be inaccurate. Need to be tested according to inspection requirements.

Four points to note before blood test

First, the time of fasting blood collection. Fasting blood usually refers to blood drawn in the early morning before eating, about 8-12 hours after the previous meal. After eating, many substances in the blood will show temporary changes, which cannot reflect the true condition of the body. Fasting blood is usually collected in the morning, but if necessary, it can also be collected 6 hours after a light meal. You should maintain your normal eating habits 2 weeks before the blood lipid test, and blood should be drawn 12 hours after a meal.

Second, it is not advisable to exercise too much before blood collection. One type of exercise is static, meaning it does not last long but is of high intensity, such as weightlifting, throwing a ball, etc. It utilizes the energy stored in the muscles and has little effect on the test. Another type of exercise is dynamic, that is, it lasts for a long time and has low intensity, such as long-distance running, swimming, cycling competitions, etc. It requires a lot of calories to maintain and has a greater impact on the test results. It should be avoided as much as possible within 2 days before the test.

Third, don’t take large amounts of vitamins before blood collection. Otherwise, some test results may be distorted. For example, taking large doses of vitamin C can affect the results of urine sugar.

Fourth, please extend your ring finger when doing peripheral blood testing. Peripheral blood sampling is suitable for testing items with blood volume less than 0.1 ml, such as peripheral blood glucose. The side of the left ring finger tip is usually chosen. First, there are more blood vessels in this area, and second, the cut will not affect the finger's continued contact with objects.