How to prepare for laboratory examinations?
We would like to share with you useful recommendations on how to prepare for laboratory tests before starting treatment or during its process.
WHY IS THIS SO IMPORTANT?
The fact is that the accuracy of the results depends not only on the laboratory, but also in many ways — on the correct preparation for their delivery.
The first and basic rule here is to conduct the study under the same conditions, that is, in the same laboratory and at the same time.
What factors can influence research results?
On the eve of passing tests, it is better to refrain from food loads, that is, to exclude fried, excessively salty, spicy, fatty foods. At the same time, a number of studies must be taken strictly on an empty stomach, which means that at least 10-12 hours must pass between the last meal and blood collection. Don’t forget that coffee, tea, and juice are also food. Before such a study, it is permissible to take only non-carbonated water
MEDICINAL PRODUCTS (LP)
Taking them can also affect your results. Therefore, if you are taking medication, be sure to warn your doctor and nurse.
For some types of research, such as hormonal studies, the phase of a woman’s menstrual cycle is of fundamental importance. Check this information with your doctor before taking the test.
TEST DELIVERY TIME
Circadian rhythms also affect the fluctuation of some hormonal and biochemical parameters. That’s why it’s so important to try to do dynamic research at the same time.
SMOKING AND ALCOHOL
It is no secret that these factors significantly distort the results of indicators of all systems of our body. These habits should be abandoned altogether. However, before taking tests, it is absolutely necessary to refrain from consuming alcohol and tobacco at least 1-2 days before taking tests.
What tests are taken strictly on an empty stomach?
FASTING FOR MORE THAN 12 HOURS IS REQUIRED
AT LEAST 8 HOURS AFTER A MEAL, PREFERABLY MORE
- blood biochemistry
- serological tests (syphilis, hepatitis A-B-C, HIV)
- hormones (TSH, parathyroid hormone)
Blood donation for psa
- For 2 days: exclude fatty, fried, highly salted and smoked dishes, taking any medications (if it is impossible to cancel-you must notify the laboratory staff about their reception);
- For 24 hours: it is necessary to exclude the intake of alcohol and any alcohol-containing beverages and energy drinks;
- In 1 hour: limit physical activity and emotional stress.
At least 7 days after palpation and ultrasound should elapse before collecting the biomaterial. And not earlier than one month after collecting the material (biopsy) for histological examination. TESTS FOR THYROID HORMONES.
- Blood collection is performed in the morning (before 10: 00), on an empty stomach (at least 8 and no more than 14 hours of fasting). You can drink water without gas;
- When studying thyroid function during treatment with drugs containing thyroid hormones, the study is carried out 24 HOURS after the last dose of the drug;
- For 2-3 days before blood collection, it is necessary to exclude the use of iodine-containing drugs.
Blood test for cancer markers
- 24 hours before the analysis: do not take any vitamins or medications (if it is impossible to cancel, you must notify the laboratory staff about their admission); limit active physical activity, limit the consumption of strong tea, coffee, and any carbonated drinks.
- 12 hours before the analysis: exclude fried, fatty, and spicy foods.
Genetic testing by blood
- For 7 days: eliminate alcohol consumption;
- For 3-5 days: eliminate cigarette smoking and consumption of alternative methods of nicotine delivery, adhere to a diet with the exception of fatty, spicy and smoked products;
- 10 hours before the study: limit food intake.
- Collection of the analysis is carried out strictly in the morning and on an empty stomach, the “average portion” of the urine stream is important;
- For 10-12 hours: give up alcohol and coloring products (beets, carrots, rhubarb, bay leaves, etc.);
- Do not get too cold or overheat before collecting the analysis.
Fecal occult blood test
- 7 days before the analysis: avoid taking any medications that have an undesirable effect on the composition of feces: NSAIDs (aspirin, ibuprofen, naproxen), barbiturates, anticoagulants, intestinal peristalsis stimulants, ascorbic acid, drugs and biologically active additives containing iron, rectal suppositories, medications whose impurities in feces change its color;
- 3 days before the test: start a diet.
any meat, poultry, fish and offal, beans, vegetables, fruits and berries that are rich in iron and vitamin C or strongly affect intestinal motility – for example, apples, celery, cranberries, oranges, spinach, nuts, cabbage, tomatoes, carrots, beets, beans, soy and lentils.