Preparation for a blood test

General recommendations

The accuracy and objectivity of the study largely depends on the correctness of the preparation of the patient. Modern laboratory equipment guarantees the reliability of obtaining data, but their adequacy depends on certain conditions and restrictions that must be observed before donating blood. In order for the information obtained to accurately reflect the real state of the patient's body, you should adhere to the general requirements:

• It is recommended to take blood in the morning on an empty stomach, and if the analysis is taken during the day, you can not eat food for 3 hours before blood sampling.
• Within 1-2 days before the analysis, you can not eat alcohol and fatty foods.
• The day before the analysis, exclude increased physical exertion, overheating or hypothermia are not recommended.
• 1 hour before blood donation, avoid any stress, including emotional, do not smoke.
• Within 3 hours before the analysis, if it is not taken in the morning, you can drink only clean water, any drink is considered food and can distort the real picture.
• If a person is prescribed drugs, their reception before analysis should be agreed with a doctor.
• Blood does not give up after any medical procedures, including physical therapy, X-rays and other examinations.

These are general rules that must be followed when giving blood for analysis, but some studies require special preparation. Only with their observance can we talk about the reliability of the data obtained. In urgent cases, a blood test can be taken without any preparation, but after a while it will have to be repeated in compliance with all requirements.

Biochemical study

In this analysis, the concentration and metabolic processes in which certain substances are included are estimated. On its basis, the calculation of special coefficients by which the risks of developing certain diseases are determined.

The main addition to the rules of preparation is the restriction in the use of certain products. A few days before the procedure, on the recommendation of a doctor, they are completely excluded. Another requirement–fasting from 8 to 12 hours before blood sampling, at this time you can drink only clean water.

Urea and uric acid analysis

3 days before the test, you should give up red meat and offal, such as kidneys and liver. It is recommended to exclude any animal food, including poultry and fish, as well as stimulating drinks.–Tea, coffee and others.

Cholesterol, lipoproteins and triglycerides

An important condition is complete fasting for at least 12 hours. For 2 days you need to completely abandon fried and fatty foods. If the patient uses drugs that reduce the level of lipids, for 2 weeks you need to abandon their use, but only after consulting a doctor.

Glucose content

The analysis is taken after fasting for 12 hours, and it is also forbidden to take any liquids except pure water. Previously prescribed drugs are better to take after blood donation, but before that you need to consult a doctor.

Glucose tolerance test

It is carried out only as directed, since it is contraindicated for people suffering from type I diabetes. For an adequate result of 3 days it is necessary to consume no more than 150 g of any carbohydrates.

Completely remove physical activity, do not overheat and do not overcool. In consultation with the doctor, you should cancel the intake of medications, including glucocorticoid hormones. Blood collections are made in a medical institution, between them is prohibited any food, drink and smoking.

Vitamin D levels

3 days before this analysis, you need to abandon drugs and dietary supplements, which include calciferol or hydrocalciferol. In addition, you need to adhere to the usual training.

Infectious research

For such an analysis, it is recommended to adhere to general rules, which will increase the accuracy of detection of antigens and antibodies. It is important to radically reduce the load, do not smoke, fast for 8 hours, it is allowed to drink clean water.

Hormones

When examining the hormonal background by blood to track the dynamics, tests are carried out several times. To do this, the analysis is taken at the same time of day, in the period of 2 or 3 weeks, which requires discipline from the patient.

Thyroid hormones

This analysis is taken in the morning, and if you need data in dynamics, it is done periodically at the same time, preferably in one place. After consulting a doctor, you should refuse to take drugs as much as possible.

If you need to determine the effectiveness of the prescribed hormone therapy, the analysis is taken no earlier than 1.5 months after the appointment of the course. Before this, you need to avoid stress, sleep, reduce physical activity. This analysis is not carried out in the acute phase of infectious diseases and metabolic disorders, the level of vitamins and fats.

Sex hormone analysis

Most female sex hormones are given on 3-5 days of the menstrual cycle, which allows you to get the most accurate result. Exception–progesterone, the analysis of which is taken on 19-23 days. The rest of the training rules meet the general requirements.

Renin-aldosterone system and adrenocorticotropic hormone

Tests for these hormones are given only in the morning and strictly on an empty stomach. Before this, you need to relax for half an hour, if you do not do this, the result may show excessive data.

Oncomarkers

PSA

Requires compliance with standard recommendations when passing a general blood test. You can take it only after passing at least two weeks after a course of prostate massage and a month and a half after surgery.

NZ SA-125

To obtain maximum accuracy, the analysis is taken 2-3 days after menstruation. Women with menopause are recommended to undergo an annual study. The day before the analysis, you need to abandon heavy (salty, fatty, fried) food.

Coagulogram

This study of the hemostasis system includes a whole set of specific parameters. Blood is taken in the morning, strictly on an empty stomach, it is not forbidden to drink clean water. If there is a need to take the analysis in the afternoon, then before that you can not eat for five hours.