In the article, we will examine what blood is taken from a vein for.
Modern diagnostic techniques make it possible to identify most diseases. For laboratory tests, blood is taken from a vein; this is a fairly simple and absolutely safe procedure. Provided that the patient is correctly conducted and has the correct program of preliminary preparation, it gives accurate results.
What is blood taken from a vein for?
The doctor obtains information about the patient’s health in various ways. Usually, the initial appointment begins with a survey, then they perform an examination and appoint tests. Blood is required for an accurate diagnosis: its study reveals pathological changes in the human body. So what is blood taken from a vein for? As a rule, the fence is carried out as part of the following studies:
- The delivery of a general analysis is prescribed as part of a routine examination to diagnose infection, inflammation and pathologies. This diagnostic method shows the cellular composition.
- Biochemical analysis. This study helps to obtain data indicating possible pathologies of the kidneys, liver and oncology. Conclusions are made based on the indicator of chemicals in the form of proteins, enzymes, lipids, and so on. Why take blood from a vein, many are interested.
- An immunological study is necessary to identify a potential allergen in a patient. Thanks to this analysis, cellular and humoral immunity is determined.
- Hormone testing demonstrates the level of major hormones along with their ratio. It is necessary to control the functions of the thyroid gland and metabolism.
Fence technique
The technique of taking biomaterial from a vein is important not only for the comfort of the patient, but also for an adequate diagnosis. It is important to exclude contact of blood with air, hands of medical personnel and devices. Most current laboratories use vacuum systems. They are safe, comfortable and make the fence less painful. Next, let's talk about the rules for preparing for the study.
What a blood test is taken from a vein can be checked with your doctor.
How to prepare for the patient?
In the event that a person is recommended to donate blood, it is important to prepare correctly for such a procedure. The procedure is not always performed on an empty stomach, this point must be checked with a doctor. It is believed that the interval between eating and taking biological material should be at least four hours. Here are the general rules for preparing for venipuncture:
- Most of these procedures are carried out in the morning, usually on an empty stomach. In the event that a person uses the services of an independent laboratory, then it is necessary to clarify the preferred hours with the conditions.
- It is advisable not to overeat on the eve, and, in addition, not to abuse spicy and heavy food. This can distort the overall picture, especially biochemistry.
- It is necessary to exclude alcohol at least one day before the analysis.
- You can not smoke one and a half hours before the procedure.
- In the event that a person was prescribed other studies, for example, x-rays or fluorography, then they must be transferred to a later time. The same is true for physiotherapeutic treatment.
- In some situations, discontinuation of the drug is necessary.
- We must try to calm down and whenever possible in every possible way to avoid any stressful situations, especially if you need to be tested for hormones.
Compliance with the above rules improves the accuracy of the results. A blood test from a vein is a necessary diagnostic tool that allows you to quickly, and most importantly, make the most accurate or refute the diagnosis. Now we will find out when the biomaterial is taken from children in this way.
What is the blood taken from a vein in children?
A child may be given a blood test for examination from a vein to evaluate the liver and kidneys. This analysis is called biochemical. After conducting a serological examination, the doctor determines the pathogen that caused the disease, and effective therapy is selected.
In case of an allergic reaction, an analysis of allergens is very informative. It helps to conclude that it should be completely excluded from the diet or from the environment of the baby as part of the prevention of such a reaction.
From a vein in children, blood is also taken to also assess the hormonal background, the degree of saturation of the body with vitamins and micronutrients, for immunological studies and even to establish a genetic predisposition to various diseases.
How do they take blood from children?
Blood sampling is carried out by an experienced nurse. In babies, veins located in the area of the elbow bend or on the back of the palm of the hand are used to take such an analysis. In some situations, doctors can take blood from a vein on the forearm, the back of the feet, or even from an artery located on the head.
The skin in the area where the biomaterial intake is planned is treated with an antiseptic. The hand above the puncture site is pulled by a tourniquet. A sterile, disposable needle and test tube are used for collection. Modern laboratories use plastic vacuum tubes, which are different for each analysis. They can differ among themselves with the color of the caps, and, in addition, with the preservative that is added to them. A vacuum system provides a safe intake of biological material.
After receiving the necessary amount of blood for the study, the tourniquet relaxes and the needle is removed. And a sterile napkin moistened with an antiseptic is applied to the puncture site, which must be strongly pressed or fixed with an elastic bandage.
What blood is taken from a vein during a physical examination when applying for a job, we will describe further.
When applying for a job
When hiring employees, they must undergo a medical examination. Mandatory for all are the following blood tests that are taken from a vein:
- Clinical analysis with the study of hemoglobin, white blood cells, red blood cells, color indicator, platelets, ESR, white blood cell count.
- Conducting biochemical screening for blood glucose and cholesterol.
Now let's talk about in which cases the biomaterial is taken for examination from a vein in women in position.
What is blood taken from a vein during pregnancy? About it below.
In pregnant
In the antenatal clinic, ladies carrying a child are prescribed blood from a vein for the following purposes:
- Research on HIV and hepatitis, which is done three times during pregnancy. The biomaterial for the study of AIDS infection, jaundice and pale spirochete (i.e. syphilis) is taken from a vein. In the event that a woman ignores the study of these infections, then she will be forced to give birth in the observation department. What blood is taken from a vein in a antenatal clinic is important to find out in advance.
- Conducting biochemistry. This analysis is given as part of the initial treatment, as well as in the eighteenth and thirtieth week of pregnancy. Using biochemical studies, you can get information about protein, lipid and carbohydrate metabolism. Blood is taken strictly from a vein. Be sure to find out the total protein with sugar levels. In addition, a test for serum iron can be performed with low hemoglobin to confirm anemia.
- Other biochemical studies are necessary in cases of chronic pathologies with biliary dyskinesia, pyelonephritis, diabetes to control a woman's condition.
- Conducting an analysis of the coagulation system, which includes a coagulogram. As part of this study, information is collected on the presence of a tendency to bleeding, which can provoke miscarriages. Before childbirth, the coagulation index increases, so the body prepares for childbirth.
- A study to determine the blood type and Rh factor. Regardless of whether the pregnant lady knows what type of blood she has, at the beginning of pregnancy this analysis is shown to absolutely everyone. If the patient has a negative group, then she needs to constantly monitor the Rhesus antibodies. Before birth, the examination is carried out more often, up to about twelve times over the entire period.
What gynecologists take blood from a vein is now clear. We learn how the preparation for such a study should go.
How to prepare pregnant women for an analysis?
Twelve hours before the study, you can not eat anything. Thus, this means that late dinner is completely canceled. A night trip to the refrigerator, of course, too. Dinner should be light, without fried, spicy, sweet food.
When you need to find out the level of cholesterol among the indicators, you need to exclude any fatty foods, even those that contain the so-called hidden fat: sour cream, butter, cheeses, cottage cheese, sausage. It is possible to drink water before passing the analysis, but in a small amount and only if you really want to. The fact is that drinking can affect the concentration of elements in the blood, this distorts the result of the analysis.
The main thing is to calm down
In the event that hormones are present among the components of the analysis, it is impossible to enter the laboratory of the laboratory assistant in an excited state. It’s better to sit outside for another half an hour in order to completely calm down and put the hormonal background in order, otherwise the results of the study can be very distorted.
We examined what blood is taken from a vein for.