When people go to the hospital to see a doctor, they often encounter blood tests, so why are blood tests so important and common? What diseases can blood draw detect?
What diseases can a blood draw detect?
Times, the deputy chief physician of the Department of Orthopedics of the Affiliated Hospital of Yangzhou University, published an article in the People’s Daily Health in July 2022, stating that the blood drawing was only a verbal statement. In medicine, this step of drawing blood is called a “blood test.”
Blood tests are subdivided into routine blood tests, hormone blood tests, organ function tests, etc. There are many diseases detected through blood tests.
Routine blood test: It mainly includes some basic indicators of blood, such as blood lipids, blood pressure, blood sugar, etc., and compares the basic indicators with reference values to diagnose whether the patient has symptoms of metabolic diseases such as “three highs”, so as to take further measures treatment measures.
Hormonal blood test: such as checking the content of thyroid hormones, adrenal hormones, etc. in the blood, so as to diagnose whether patients have endocrine diseases, such as hyperthyroidism, hypothyroidism, etc. In the blood hormone test for women, the estrogen content can also be used to preliminarily diagnose whether there are hidden gynecological diseases.
Organ function test: It is to judge whether the internal organs are healthy or not through the condition of blood. For example, the content of transaminase and bilirubin in the blood can be used to diagnose hidden dangers of liver disease; the health of blood vessels and heart can be judged by the content of enzymes and metabolites.
In addition, under the conditions of modern medicine, blood tests can also be used to screen for tumor markers and carcinoembryonic antigens, which can also play a very good role in the prevention and treatment of cancer.
In summary, just one blood draw can detect a variety of potential diseases such as metabolic diseases, endocrine diseases, and organ diseases.
Why are there several tubes in one blood draw?
Wang Xing, deputy chief physician of the Cardiovascular Department of the No. 983 Hospital of the Joint Logistics Support Force, posted an article in the People’s Daily Health account in December 2020 explaining that if a tube of blood can be drawn to find the results you want to check, a tube of blood will be drawn naturally. It is precisely because one tube of blood cannot technically meet the items to be checked, so two, three or even more blood tubes need to be drawn.
For each blood test, on the one hand, the kit and the test machine are different, and on the other hand, each test must have a certain amount of blood to be more accurate. Therefore, several tubes are needed, and each tube must have a certain amount of blood.
The most common inspection items: blood routine, macrobiochemistry, coagulation system, virus series, tumor series, thyroid function, blood sugar series, etc. These major items have different assay methods, use different kits, or use different machines, so if the above inspections are required, they all need to be packaged in different test tubes.
I had blood drawn in the morning, why did I draw again in the afternoon?
Wang Xing explained that some projects need to monitor fluctuations that occur over a certain period of time and therefore require repeated blood draws on the same day.
For example, it is entirely possible for cardiac enzymes related to cardiovascular disease to be pumped in the morning and have to be pumped in the afternoon.
Because when myocardial infarction is diagnosed or highly suspected, if the myocardial enzymes tested after blood draw in the morning are normal, myocardial infarction cannot be ruled out, and blood draws again in the afternoon for verification. Because myocardial enzymes change over time, especially within 24 hours of myocardial infarction, there will be significant changes, so multiple blood draws are required.
For example, to check the blood sugar series, you need to draw three meals on an empty stomach, and after three meals, you will naturally need to draw blood multiple times.
For example, if the blood oxygen is low, it is necessary to observe the blood oxygen saturation level in time. It may be necessary to draw blood every few hours.
Therefore, projects that are greatly affected by the disease within 24 hours, especially when the disease is unstable, may have repeated blood draws on the same day.
Why is the blood drawn black?
Looking at the blood that has just been drawn from the collection tube, people usually think, why is the blood black? Is there a problem with your body?
Ding Huizhen, chief physician of the Department of Respiratory Medicine of the Affiliated Hospital of Yangzhou University, introduced in an article in People’s Daily Health in April 2021 that healthy blood is actually dark red.
Because the blood test is usually drawn from a vein, the color itself is dark. In addition, it is usually in an empty stomach, without food or drink all night, and the color of the blood will deepen. In addition, due to the vacuum inside the collection tube, it looks dark red. Don’t worry, it’s normal.
The blood that is bright red is arterial blood. The amount of hemoglobin in the blood is high and the oxygen content is high, so it looks red.
If the color of the blood drawn is light, it may be caused by anemia. After the test results come out, the body should be adjusted in time; the color of blood drawn from patients with high blood lipids is usually milky white, also known as “milk blood”, which is very Dangerous, treat as soon as possible.