Why can't physical examination eat and drink?

summary

Things related to physical health often deal with food. For example, when taking drugs, you need to avoid eating certain things, and you also need to avoid eating before examination. So why can't you eat and drink water before physical examination?

Why can't physical examination eat and drink?

In the human digestive system, water absorption and elimination are very fast. Therefore, the intake of water before blood drawing will be absorbed into the blood soon, which will make the extracted blood diluted, and then lead to the decrease of the concentration of the detected substances, which may lead to inaccurate detection results.

Blood test: after eating, the blood concentration will increase, and the blood will become turbid and difficult to see. It is called "fatty blood" in medicine, which will directly affect the liver function, fasting blood glucose and other test results. Abdominal ultrasound. After eating, gallbladder will contract, need to release bile to help digestion, intestinal will also produce a large number of bubbles, which will interfere with abdominal ultrasound, so only in fasting abdominal ultrasound examination.

Infrared thermal imaging. Far infrared thermal imaging is to judge whether the body is healthy according to the heat difference of various parts of the body, which can play a predictive role in diseases. Eating will make the heat of some parts of the body suddenly increase, which will affect the detection results. C-14 breath test. Carbon 14 breath test is the simplest method to detect Helicobacter pylori in the stomach. Gastric examination can only be carried out on an empty stomach. Otherwise, it is impossible to find out whether the stomach is healthy or not.

matters needing attention

Especially can't eat these things before physical examination, specific as follows: 1, high iodine food: such as deep sea fish oil, algae, kelp, sea fish, etc., because these seafood high iodine content, will affect the thyroid function test. 2. Purine containing food: during physical examination, blood uric acid concentration should be detected. As purine containing food has an impact on uric acid detection, do not eat purine containing food. 3. Sugary food: try not to eat and drink all kinds of sweets and drinks before physical examination. 4. High protein food: such as eggs, meat, so as not to affect the detection of renal function. To sum up, the diet before physical examination needs to be light, oily food can not be touched, and try not to eat water on the day of examination.