A prerequisite for the harmonious development and functioning of the human body is a normal level of thyroid hormones. They affect the growth and differentiation of tissues in the body, metabolic processes, stimulate protein synthesis and influence the formation of the reproductive sphere (sexual development, menstrual function, ovulation). The formation of thyroid hormones depends on the intake of iodine in the human body.
To diagnose diseases associated with thyroid hormones, total T3 (total triiodothyronine), total T4 (total thyroxine), free T3 (free triiodothyronine), free T4 (free thyroxine) are determined in the blood. For example, in hypothyroidism, a decrease in the function of the thyroid gland is observed, in the blood we observe an increase in the level of thyroid-stimulating hormone (TSH), low numbers of free thyroxine (T4), total thyroxine (T4) and total triiodothyronine. The insufficient function of the hypothalamus and pituitary gland in hypothyroidism is indicated by a decrease in the level of TSH (thyroid stimulating hormone). With hyperthyroidism, a decrease in TSH concentration is observed. With thyrotoxicosis, T4 (free thyroxine) may remain within the normal range, but the determination of free triiodothyronine (T3) will be very informative, an increase in its concentration in the blood is observed.
You can see the functional state of the thyroid gland using a blood test for hormones. The study is carried out on an empty stomach, blood is taken from a vein. It is necessary to stop taking iodine-containing drugs 3 days before the study. Avoid taking thyroid hormones 7 days before the study procedure. It is preliminarily recommended, in the case of treatment with thyroid hormones, to consult with an endocrinologist for the possible cancellation of iodine-containing drugs. It is necessary to limit physical activity, avoid psycho-emotional stress, exclude alcohol and smoking.
In conclusion, issued in the diagnostic center, the values of indicators of all thyroid hormones will be indicated: the norm for T3 in men and women is 1, 8-4, 2 pg / ml; free T3 - 1, 8-4, 2 pg / ml; total T4 (thyroxine) - 4.5-10.9 mcg / dl; Free T4 (free thyroxine) - 0.8-1.3ng / dl; TSH (thyroid stimulating hormone) - 0, 35-5, 5 μIU / ml.