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[Free thyroid hormones in pregnancy].
Nuklearmedizin. Nuclear Medicine
|June 1, 1984
Summary
Thyroid hormone levels, including free thyroxine (FT4) and free triiodothyronine (FT3), remain within normal ranges during late pregnancy, indicating euthyroid status. While FT4 and FT3 levels are lower than in non-pregnant individuals, they do not indicate hypothyroidism.
Area of Science:
- Endocrinology and Metabolism
- Reproductive Medicine
- Thyroid Physiology
Context:
- Thyroid hormone levels are crucial for maternal and fetal health during pregnancy.
- Assessing thyroid function in pregnant women requires specific reference ranges.
- Previous studies have shown variations in thyroid hormone levels during gestation.
Purpose:
- To evaluate thyroid hormone status in healthy pregnant women in late pregnancy.
- To compare thyroid hormone parameters between pregnant women and euthyroid non-pregnant subjects.
- To determine if thyroid hormone levels in late pregnancy indicate euthyroid status.
Summary:
- Thyroid hormone parameters including total thyroxine (TT4), total triiodothyronine (TT3), reverse triiodothyronine (rT3), TSH, free thyroxine (FT4), and free triiodothyronine (FT3) were measured.
- Calculated indices such as FT4-index, TT4/TBG, FT3-index, TT3/TBG, and free hormone indices were analyzed.
- Results indicated that FT4 and FT3 levels in late pregnancy, though significantly lower than in euthyroid subjects, remained within the normal range, confirming euthyroid status.
Impact:
- Provides valuable data on normal thyroid hormone levels in late pregnancy.
- Helps in establishing appropriate reference ranges for thyroid function tests in pregnant populations.
- Contributes to the accurate diagnosis and management of thyroid disorders during pregnancy.