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Hyperthyroidism and pregnancy. II. Thyroid function in normal pregnancy and in pregnancy associated with
Endocrinologie
|April 1, 1982
Summary
Diagnosing hyperthyroidism during pregnancy is challenging. Increased triiodothyronine (T3) and free thyroxine (T4) levels, alongside elevated thyroxine-binding globulin (TBG) in euthyroid pregnancies, help differentiate conditions.
Area of Science:
- Endocrinology
- Reproductive Medicine
- Clinical Chemistry
Background:
- Hyperthyroidism in pregnancy presents diagnostic challenges.
- Accurate diagnosis is crucial for maternal and fetal well-being.
- Standard thyroid function tests can be altered by normal pregnancy.
Purpose of the Study:
- To identify key diagnostic markers for hyperthyroidism in pregnant women.
- To differentiate between normal pregnancy and hyperthyroid pregnancy using thyroid assays.
- To inform timely and appropriate therapeutic interventions.
Main Methods:
- Assayed protein-bound iodine (PBI), total thyroxine (T4), free thyroxine (FT4), triiodothyronine (T3), reverse T3 (rT3), thyroxine-binding globulin (TBG), thyroid-stimulating hormone (TSH), and long-acting thyroid stimulator (LATS).
- Compared results from 136 euthyroid pregnant women (months 2-9) with 14 pregnant hyperthyroid women (months 2-3).
- Included urinary catecholamine testing for hyperthyroid group.
Main Results:
- Identified specific alterations in thyroid status parameters in hyperthyroid pregnancies compared to normal pregnancies.
- Observed increased T3 and free T4 levels in hyperthyroid patients.
- Noted elevated TBG levels in euthyroid pregnant women, serving as a potential confounding factor.
Conclusions:
- A comprehensive panel of in vitro assays is necessary for accurate hyperthyroidism diagnosis in pregnancy.
- Increased T3 and free T4, when considered relative to elevated TBG in euthyroid pregnancy, are key discriminators.
- Timely diagnosis enables appropriate management to ensure optimal outcomes.