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Decryption of analyzes

Thyroid hormones: the norm in women, table

The thyroid gland is an organ of internal secretion that regulates the water-salt metabolism in the body, is located on the front surface of the upper trachea and the thyroid cartilage, from which it got its name. In the "west" it is called the thyroid gland.

It is a collection of microscopic follicle bubbles filled with a colloidal mass consisting of various proteins. Iodine-containing compounds, triiodothyronine T3 and tetraiodothyronine, thyroxin T4, prevail.

When the thyroid gland is removed or underdeveloped, apathy, reduced intelligence, slowing of the heart rhythm, growth and ossification processes, dysplasia of hair and nails, and swelling are observed.

When hyperthyroidism accelerates the metabolism: there is a general emaciation, accelerates the heart rate, the temperature rises.

The thyroid gland is regulated by the pituitary gland - an appendage of the brain, the anterior lobe of which secretes the thyroid stimulating hormone.


Thyroid Hormones

Thyroid Hormones

Secrets of T3 and T4 of this gland around the clock responsible for the energy metabolism in the body, prompting the cardiovascular system, brain and central nervous system to a full harmonious functioning.

With an increase in their blood levels (hyperthyroidism), blood pressure rises, stenocardia appears, constant psycho-emotional arousal, hand tremors, tendency to aggression develops, sweating increases. The extreme degree of such a condition is called obsolete memory based disease.

Hypothyroidism — a decrease in T3 and T4 concentrations — develops neuralgic problems, weakness of the musculoskeletal system, disrupts the mental development of children to complete cretinism (this happened before the discovery of the role of thyroid hormones in the 20th century), and sex disorders occur in the genital area.

In women with a deficiency of thyroid hormones, there is a violation of the menocycle and infertility. This is how the interaction of thyroid hormones with adrenal hormones (progesterone) and ovaries (estrogen) manifests itself.

Norms of thyroid hormones in the blood

Norms of hormones T3 and T4

About 90% of thyroid secretion accounts for thyroxin (T4), which consists mainly of iodine and a small amount of protein. The norm of the thyroid hormone in women is 9–19 pmol / l, it is invariable even with a benign tumor and an overgrowth of the mass of the gland — a colloid goiter.

Thyroxin (T4) is considered as a depot of iodine, necessary for the construction of T3 - an active hormone that affects the vital activity of the organism. The concentration of triiodothyronine (T3) is normal 2.62-5.69 pmol / l.

During pregnancy, the concentration of these hormones increases.

Who shows a thyroid gland?

Approximately 70% of humanity has colloid nodes in the thyroid gland. It is estimated that 40% of the nodes are caused by iodine deficiency. A natural organ defense mechanism works - it expands in order to get the missing element from the blood. In this case, to clarify the diagnosis practiced ultrasound.

Only if a cancer is suspected, an additional puncture biopsy and a radiological X-ray radiography method are prescribed - it is 10 times more dangerous than the usual X-ray due to radiation of iodine radionuclides.

A blood test is taken:

  • with the growth of gland tissue;
  • in case of suspected hypo-or hyperthyroidism;
  • first signs of iodine deficiency;
  • genetic predisposition to thyroid pathology;
  • women with infertility;
  • women during pregnancy.

During pregnancy, venous blood is examined for concentration in it:

  • hormones T3 and T4;
  • pituitary hormone (TSH);
  • antibodies to thyroglobulin;
  • antibodies to thyroperoxidase.

Thyroid hormone level analysis

Thyroid hormone level analysis

A common opinion is that in order to obtain objective data on the state of the hormonal background of the body, it is necessary to follow the rules for donating blood to the hormone level:

  1. From the last intake of hormonal contraceptives and other hormonal drugs, as well as iodine-containing multivitamins, 1 month should pass before taking the test;
  2. From the last use of alcohol or smoking should pass 1 day;
  3. From the last meal to the test should be 8 hours;
  4. On the eve you can not eat fatty, spicy, smoked food;
  5. On the eve it is necessary to limit the motor and emotional activity.

But endocrinologists dispute these rules, arguing that the secretory secretions of the thyroid gland, which are responsible for the stability of the functioning of the body, cannot respond to so many factors. Their concentration is inversely related to the level of TSH, but the intake of iodine or individual foods does not affect their synthesis.

Only one condition is valid - it is always best to carry out analyzes in the same laboratory, because there are different methods of determination (RIA, ELISA) and different calibrations of the apparatus - their results may be incorrectly interpreted.

Table: the rate of thyroid hormones in women

Indicator Norm (µMU / ml) Interpretation of results
TSH 0.4 - 4 Excess - primary hypothyroidism or secondary thyrotoxicosis. Reduction - primary or secondary hyperthyroidism
Free t4 0.8-1.8 or 9-19 pmol / l Reduction - hypothyroidism. Excess - thyrotoxicosis
Free t3 3.5-0.8 or 2.62-5.69 pmol / l Reduction - hypothyroidism. Excess - thyrotoxicosis
Tireoglobulin thyroidectomy <1–2 ng / ml rate <50ng / ml, iodine deficiency <70 ng / ml Increase - subacute thyroiditis, thyroid adenoma, as well as evidence of the development of cancer or cancer recurrence
Antibodies (AT-TPO) <30 IU / ml - negative result 30 - 100 IU / ml - borderline value> 100 IU / ml - positive result The development of autoimmune processes or postpartum thyroiditis
Antibodies (AT-TG) <100 honey / l The development of autoimmune processes

A significant difference in the figures is shown by the norm of hormones in women: T4 and T3 react sensitively to TSH commands (in fact, this is the secret of the pituitary, but it is responsible for the production of thyroid hormones, therefore, monitoring its amount is carried out when examining the function of the gland).

A decrease in the TSH content may be in the first trimester of pregnancy or in multiple pregnancies. Not only female but also male infertility often depends on the concentration of TSH in the blood. Reducing T3 and T4 during pregnancy is dangerous and requires treatment.


This is general information about the value and norms of thyroid gland hormones. Their level in the blood depends on the sex and age of the person, so only the endocrinologist should evaluate the results of the analysis of thyroid hormones, taking into account the patient’s condition, the overall clinical picture and data from other examinations.


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