Endocrine Abstracts

Introduction: Thyroid physiology changes during pregnancy so the use of pregnancy-specific reference ranges for TSH and FT4 in order to adequately diagnose gestational thyroid disease is necessary. According to literature, in twin pregnancy, TSH can be in low levels during first trimester due to a much higher and more sustained peak of hCG (TSH-like activity of human chorionic gonadotropin) but it will be normalized at the end of the second trimester or within 22 weeks. Hypere...