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Rules for preparing and giving blood for hormones
- On the eve of blood collection for ELISA tests (hormones, cancer markers, autoimmune antibodies, etc.) it is necessary to exclude physical activity, stressful situations, physiotherapeutic procedures, taking medications (except in cases of medication prescribed by a doctor, when the decision to cancel medication is made by the attending physician), taking oral contraceptives, drinking alcohol and eating fatty foods. Immediately before the study exclude smoking.
- Standard blood sampling is performed in the morning, on an empty stomach (at least 8-12 hours after the last meal), in the treatment room, in the patient's position "sitting" or "lying down", in physiological rest, from the ulnar vein in compliance with the rules of asepsis and antisepsis. Before taking blood, the patient should be given a 15-minute rest.
- When examining thyroid function during treatment with drugs containing thyroid hormones, the study should be performed 24 hours after the last intake of the drug. For 2-3 days before blood sampling it is necessary to exclude the intake of drugs containing iodine.
- When testing for PSA, one week before the analysis, exclude any manipulations with the prostate gland.
- When testing for ACTH, renin/angiotensin, it is recommended to take blood from 7 to 9 am. Reference values of these hormones are designed for this time. The patient should be at rest (sitting or lying down) for at least 1 hour before blood collection.
- When testing for cortisol and aldosterone, blood should be drawn before 10am.
- When examining sex hormones for women of reproductive age, it is necessary to indicate in the direction the time and date of blood collection, day and phase of the menstrual cycle, in case of pregnancy - indicate the term of pregnancy.
- Complex tests (several tests in one sample) are more informative.
- All blood tests for hormones for greater reliability and the ability to interpret the results are recommended to be carried out not once, but in dynamics. Repeated studies are carried out at the same time of day after 2-3 weeks. Analysis of the results of studies performed in dynamics is more informative both in diagnostic and prognostic terms.
- If the study is conducted during the period of drug treatment, it is necessary to indicate in the referral the name of the drug and the time of the last intake.
See also