What can be checked by physical examination and blood drawing? Why can't I drink water before physical examination
4hw.com.cn: taking blood is a very important step in physical examination. We all know that we can't drink water and eat before physical examination, otherwise it will affect the accuracy of test data. Do you know what can be found in physical examination of taking blood? What are the effects of drinking water and eating before physical examination of taking blood? Let's have a look!
What can be checked by physical examination and blood sampling
The more blood you draw, the more items you check! The items you check are different for the blood in different color tubes!
[purple test tube] - routine blood test, blood type test. Through blood analysis, it can be found whether there are anemia, bacterial infection, virus infection, leukemia and other blood diseases. Generally, the blood volume is 1-2ml.
[green test tube] - routine biochemical items and hemorheology examination. Biochemical items include liver function, kidney function, blood lipid and blood glucose; hemorheology is mainly to detect whether there are risk factors such as hypertension, hyperlipidemia, diabetes, coronary heart disease, myocardial infarction and thrombosis. The general blood volume is 3.5-4ml.
[red test tube] - immunoassay and tumor screening. Immunoassay includes thyroid function, rheumatism, eugenics, hormones, etc. Cancer screening is mainly the auxiliary diagnosis and early detection of various cancers. The general blood volume is 3.5-4ml.
[black test tube] - ESR test is used to distinguish myocardial infarction and angina pectoris, gastric cancer and gastric ulcer, pelvic cancer mass and ovarian cyst, as well as to observe the disease change and curative effect of tuberculosis and rheumatic fever. Generally, the blood volume is 2-4ml.
[blue test tube] - fibrinogen test. Items used to test the coagulation function of the body. It is used to check liver disease, kidney disease, atherosclerosis, cardiovascular and cerebrovascular diseases, etc. The general blood volume is 2-3ml.
[yellow test tube] - special immune and biochemical items, such as immunoglobulin, serum insulin, etc. It is mainly found in infection, tumor, autoimmune disease, chronic active hepatitis, cirrhosis and lymphoma. The general blood volume is 3.5-4ml.
Can you drink water and eat before taking blood for physical examination
As long as is does not eat the inspection item inevitably request does not drink the water!!! Drinks the water to be able to reduce the blood silk degree. Decrease the test index. (but drinking a little saliva won't make a big difference to the blood. don't worry. )
More serious is eating, eating high protein food.
Because 1. If each assay adopts different methods, the normal value is different, and the establishment of the normal value is generally summed up after a large number of normal people take fasting blood for examination. Because the body is in a relative basic metabolic state when fasting, it can exclude the influence of diet and other factors, so the fasting blood test can reflect the real situation of human blood.
2、 Avoid the influence of eating a variety of foods on some components of the blood. After eating, food is initially digested by oral chewing, then digested and absorbed by gastrointestinal tract into blood, and then transported to various tissues and organs by blood. Therefore, some components of food entering the blood will increase the concentration of some components in the blood, thus affecting the accuracy of the test results.
3、 If you have eaten before the blood test in the morning, a large number of chylous particles generated after food digestion will be absorbed into the blood quickly, and the blood will become 'turbid', which is called 'fatty blood' in medicine. Because many blood biochemical tests are made by the change of sample color, if the blood appears turbid due to chylous particles, then it is difficult for the inspectors to observe clearly, especially for the determination of blood lipid, because the fat blood can also affect the accuracy of the determination.
What is the effect of drinking water before physical examination
Many people drink water, drink, mainly worry about the physical examination of blood routine, urine routine test results have an impact. Physical examination center experts explained that in the early morning of the day of physical examination, you can drink 200 ml of water (a cup of water of ordinary size) after getting up, which will not affect the results of physical examination. The blood content of our body is about 7-8% of our body weight, so the blood volume of people who weigh about 60 kg is about 4200-4800 ml (about 7-8 bottles of beer).
If you drink 200ml of water in the morning of the physical examination, it will take you half an hour to get blood from your home to the physical examination office of the hospital, and then you will be taken blood. At this time, the water you drink has already been absorbed and permeated into the tissue to participate in metabolism. During this half hour, 20-40 ml urine will be generated, and part of it will be excreted through breathing and sweating. So your blood volume will not increase by more than 40 ml at that time, and the proportion is less than 1%, which will not have any impact on the blood indicators.
But experts also stressed that drinking sugary drinks on an empty stomach will suddenly increase blood sugar, especially within a few hours before blood sampling for physical examination, it is better not to drink sugary drinks to avoid affecting the results of physical examination.
Physical examination is one of the effective ways to prevent physical diseases. Physical examination is also very important. Some precautions can only be more accurate if we abide by the results of physical examination. Many people know that fasting before physical examination, but does fasting eat nothing? Can you drink water before physical examination? Let's see the introduction of experts.
It is necessary not to eat before physical examination, but not to drink water deliberately. Many people dare not drink water mainly because they are worried about the influence on the test results of blood routine and urine routine during physical examination. In fact, as long as the amount of drinking water is properly controlled, drinking some water before physical examination will not affect the results of physical examination.
According to experts, after getting up on the day of physical examination, you can drink a small glass of water to ensure the necessary water for your body. The blood content of our body is about 7-8% of our body weight, so the blood volume of people who weigh about 60 kg is about 4200-4800 ml. If you drink 200 ml of water in the morning of the physical examination, and you have a period of time before you arrive at the physical examination center, the water you drink has already been absorbed, and has penetrated into the tissue to participate in metabolism. During this half hour, 20-40 ml urine will be generated, and part of it will be excreted through breathing and sweating. So your blood volume will not increase by more than 40 ml at that time, and the proportion is less than 1%, which will not have any impact on the blood indicators.
But experts also stressed that after arriving at the physical examination center, you can no longer drink water, because there are blood routine and urine routine tests in the physical examination items, drinking water will have some impact on the results of these tests, and you can drink water and eat after completing all the fasting examination items.