A thyroid-stimulating hormone controls the hypothalamus: there TTG is formed and from there it enters the pituitary gland, contributing to the secretion of TSH. Its level decreases and increases depending on the state of health of the pregnant woman. If the TTG deviates strongly from the norm, it carries a risk to the future baby and complicates the course of pregnancy. Although, in any case, deviation from the norm of TTG during pregnancy is not an indicator for its interruption.
Beyond pregnancy the normal TSH is 0, 4-4, 0 mU / L. As for future mothers, then these figures are usually understated. As a rule, there is a moderate decrease, which ranges from 0, 1-0, 4 mU / L. But this is only when the TSH level is determined by test systems with high sensitivity. If, however, low sensitivity systems are used for the determination, then TTG can be zero. Suppressed it will be and in the case when the future mommy has multiple pregnancies.
The lowest TSH values ??fall, as a rule, for the first trimester - 10-12 weeks of pregnancy, but in some, it may be underestimated in the second and third trimester.
If the level of TSH is overestimated - especially in the early stages - it is likely that a woman will be prescribed therapy with L-thyroxine (L-T4). When the thyroid-stimulating hormone begins to be released more, the pregnant woman's neck is slightly thickened.
In general, the level of hormones TSH during pregnancy varies throughout the term of pregnancy. In every trimester, it is different. Assess the condition of TTG doctors. They, if necessary, prescribe additional examinations, for example, echographic examination, fine needle aspiration biopsy.
During pregnancy, the expectant mother needs to monitor her endocrine system and hormonal background. This is especially important in the first trimester, when the baby still does not have a thyroid gland, and therefore it depends entirely on mammal hormones. And only in the tenth week of pregnancy the embryo is able to capture iodine on its own.