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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Thyroid function testing prior to fertility treatment: will we ever agree?

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Subclinical hypothyroidism (SCH), often asymptomatic, affects fertility and pregnancy outcomes. Current guidelines vary on routine thyroid screening for women seeking fertility treatment due to differing TSH level recommendations.

Keywords:
assisted reproductionhypothyroidisminfertilitypregnancythyroid autoimmunitythyroid function test

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Area of Science:

  • Endocrinology
  • Reproductive Medicine
  • Women's Health

Background:

  • Thyroid disorders, particularly hypothyroidism, are highly prevalent in women and impact fertility and pregnancy.
  • Subclinical hypothyroidism (SCH), characterized by elevated thyroid-stimulating hormone (TSH) with normal thyroid hormone levels, often presents asymptomatically but carries risks for adverse outcomes.
  • Thyroid autoimmunity (TAI) can coexist with SCH and may influence its progression, especially during pregnancy.

Purpose of the Study:

  • To review the current discourse and varied recommendations regarding routine thyroid function testing in women experiencing subfertility.
  • To highlight the discordance in clinical guidelines for diagnosing and managing SCH in this specific population.

Main Methods:

  • Literature review and analysis of existing clinical guidelines from major international thyroid and obstetrics/gynecology associations.
  • Examination of the diagnostic criteria for SCH, focusing on the lack of consensus for the upper limit of normal TSH.
  • Discussion of the implications of these variations for routine screening protocols in fertility settings.

Main Results:

  • Significant variation exists among prominent health organizations (e.g., ATA, ETA, RCOG vs. NICE, ASRM) regarding routine thyroid screening for subfertile women.
  • Some guidelines recommend TSH screening with or without antibody testing, while others do not support routine testing.
  • The lack of a unified TSH threshold contributes to diagnostic and therapeutic inconsistencies.

Conclusions:

  • There is a notable lack of consensus on routine thyroid function testing for subfertile women, leading to varied clinical practice.
  • An updated American Thyroid Association guideline, expected to include subfertility and gain international endorsement, is anticipated to address these discrepancies.
  • Clarification of screening recommendations is crucial for optimizing fertility outcomes and managing risks associated with subclinical thyroid dysfunction.