Correspondent Fu Xuan Yangzhou Release Reporter Lu Kangjie
Recently, a reader asked a question about taking blood during the physical examination, and there are several tubes in one drawing, which is really painful. , In everyone’s opinion, a little bit of blood is enough for testing. How can you draw so much? Why is the blood drawn out black? Is the blood that cannot be used thrown away? Today, Ding Huizhen, chief physician of the Department of Respiratory Medicine, Affiliated Hospital of Yangzhou University, will popularize these issues for you.
Why are there several tubes in one blood draw?
The inspection items require different inspection machines to complete
A lot of blood is drawn in the eyes of patients, but in the eyes of doctors, these are all necessary, and each test item requires a certain amount of blood blood, so as to detect diseases in the body. Furthermore, the blood testing machines are different, and it cannot be done on one machine, but must be done separately.
For example, fever and cough need to be checked for viral or bacterial infection, whether blood sugar and blood lipids are normal, thyroid function, tumor markers, electrolyte levels, etc., can all be detected through blood tests. Of course, blood drawing is not the only one Inspection methods, and some diseases require comprehensive inspection and judgment in combination with other project methods.
In order to prepare blood for different test items, it needs to be marked separately and distinguished by different colors so as not to be confused. For example, the common blue tube is to check the coagulation function, and the purple tube is to check the blood routine.
Is it poisoned if the blood turns black?
Healthy blood is dark red
Looking at the blood just drawn from the collection tube, people usually think, why is my blood black? Isn’t normal blood bright red? Is there a problem with your body? Is it poisoned? Sometimes when I ask the medical staff who drew blood, the other party will say that this is normal, but the patient does not think so, and then develops bad associations.
In fact, healthy blood is dark red. We usually draw blood from veins for blood tests, and its color itself is dark. And blood is usually drawn on an empty stomach. If you don’t eat or drink all night, the blood will become darker. In addition, the inside of the collection tube is vacuumed, and it looks dark red. Don’t worry, this is normal.
Those bright red blood are arterial blood, which has a high amount of hemoglobin and oxygen, so it looks red. If it comes out pink or white, it’s not normal. The light color of blood may be caused by anemia. After the test results come out, you should adjust your body in time. The blood drawn from patients with high blood lipids is usually milky white, also known as “milk blood”. This situation is very dangerous and should be treated as soon as possible. , eat blood lipid lowering drugs.
Where does the blood go after the blood test is done?
Destroyed after sterilization
Where the blood goes after the test is also a matter of common concern for everyone. They are afraid that the hospital will do bad things with their blood, and they are also afraid of their blood samples. confused with others. The normal process is to send it to the laboratory first, and the doctor will get a laboratory test after the test. If the blood is not used up, it will be temporarily stored. For example, some patients are hospitalized, and other items may be tested, so that there is no need to draw blood again. In addition, if the patient has doubts about the test results, the test can also be repeated.
Unused blood samples will be stored in the hospital for about a week. After expiration, they will be processed centrally and placed in a special processing department. They will be disposed of by various sterilization methods, and finally sent to the destruction site. So, you don’t have to worry about your blood being used for illegal purposes.
Ding Huizhen said that this is why several tubes are drawn every time the blood is drawn. This is because the purposes and test items are different. Unused blood will be temporarily stored for a week for future use. Re-examination, if the patient disagrees with the results, can also request a re-examination.
Editor: Ginger