Modern diagnostic methods make it possible to determine the content of substances in the biomaterials that are analyzed with high accuracy. Despite this, the probability of errors that distort research data remains quite high. More than 65-95% of errors may occur due to poor preparation for testing.

There are established rules for biomaterial sampling. Each individual laboratory examination has its own rules. Their implementation guarantees accurate data. Many factors influence the chemical composition of the blood:

• Food;

• exercise stress;

• medicines;

• physiological cycles.

As a rule, laboratory equipment is configured in such a way that these factors are not taken into account. As a result, the normal state of the human body can be regarded as a disease or pathology.

In order not to have to worry and get upset in vain, it is enough just to follow the simple rules for preparing for the test:

• in no case should you eat food and any drinks for 11-14 hours before taking a general clinical or biochemical blood test;

• it is better to donate blood before 9 o'clock in the morning;

• before testing, if possible, high physical activity should be avoided, it is also forbidden to drink alcohol and smoke;

• for 1-2 days, completely eliminate foods that contain a large amount of fat from the diet;

• before donating blood, you should not change the established diet;

• before taking urine, you should not eat dishes from the liver and kidneys, as well as minimize meat and fish products;

• it is worth remembering that strong tea and coffee influence the indicators of urine and blood;

• any medications, chewing gum and even toothpaste can greatly change blood glucose levels;

• in the implementation of long-term treatment, the same types of tests are recommended to be taken at the same time of day.