How many hours of fasting is considered fasting

When the human body is fasting for a long time, it will become weak and the mental state will change greatly. It is also easy to reduce the body's resistance, which can easily induce some diseases. However, there are many examination items that require patients to be fasting. Some patients do not know enough about the fasting time and do not know how long to stick to it. If the time is too short, it will affect the effect of the examination. So how many hours of fasting is considered fasting?

First, how many hours of fasting is considered fasting? Fasting examination usually requires fasting for more than 8 hours and less than 12 hours. Therefore, you should not eat or drink water before dinner or after 10 o'clock at the latest before the examination. The examination the next day will be considered fasting. For some tests, you don't need to fast. It depends on the part and organ examined or the blood test. For a thyroid test, fasting is not required.

Second, under normal circumstances, the specific requirements for fasting required by laboratories are: the night before blood collection, the person who wants to have a physical examination should maintain his usual living habits, maintain a normal diet structure, eat light meals, do not drink alcohol, coffee, or strong tea, and get a good rest. When you get up the next morning, don't eat breakfast, drink little or no water, don't do morning exercise, and go to the hospital with a calm mind and wait for blood drawing. This kind of blood sample is a good sample that accurately reflects the condition.

Second, as we all know, taking medicine can be divided into "empty stomach" and "full stomach". Many medicine instructions state "take before meals" or "take after meals". What is considered "before meals" and what is considered "after meals"? "Take before meals" means that this medicine needs to be taken on an empty stomach, 1 hour before meals or 2 hours after meals to facilitate absorption. If you have just eaten a lot of snacks before a meal, then "before meal" at this time is not "empty stomach" and cannot be considered as a real "before meal". "Take the medicine after a meal" means taking the medicine half an hour after a full meal, using food to reduce the drug's irritation to the gastrointestinal tract or promote the gastrointestinal absorption of the drug. Similarly, if you have just eaten a lot of snacks before a meal, you don’t have to be dogmatic and wait until after the meal to take the medicine, because you will already be “full” at this time.

How many hours of fasting is considered fasting? When we say you can't eat tomatoes, bananas, etc. on an empty stomach, we are referring to before each meal, that is, four or five hours after a meal. Of course, if you eat a lot of snacks before a meal, it is not considered fasting.