Gestational diabetes & diabetes in pregnancy
Pregnancy after Hemithyroidectomy: Increased Risk of Gestational Overt Hypothyroidism Despite Favorable Obstetric Outcomes: A Nationwide Study
Authors' conclusion
Preconception hemithyroidectomy is associated with a markedly increased risk of gestational hypothyroidism and a higher need for thyroid hormone replacement, particularly in women treated for thyroid cancer.
Study context
- Population
- Euthyroid pregnant women, comprehensive integrated healthcare databasepregnancies
- Participants
- 521 vs 4,168
- Exposure
- Preconception hemithyroidectomy vs intact thyroid gland
- Hemithyroidectomyn = 521
- Controlsn = 4,168reference
- Outcome
- Overt gestational hypothyroidism (elevated TSH with low free T4)
Methodological detailsnationwide, population-based, age- and BMI-matched (81 ratio)
- Nationwide
- Population-based
- Age- and BMI-matched (81 ratio)
Main finding
As reported in the abstract
Overt gestational hypothyroidism
P < 0.001
Observational data: associations, not effects.
Secondary outcomes
Thyroid hormone replacement therapy during pregnancy
P < 0.001
| Outcome | Hemithyroidectomy | Controls | P value |
|---|---|---|---|
| TSH >10 mIU/L | 4.7% | less than 0.1% | P < 0.001 |
Interval from surgery to gestational diagnosis of overt hypothyroidism
- Median interval from surgery to gestational diagnosis
- 2.5 years (IQR 1.0-5.4 years)
- Nearly two-thirds of affected women already met biochemical criteria at first prenatal assessment
Overt gestational hypothyroidism by surgical indication
- Risk highest among those operated for thyroid cancer
Missed first-trimester TSH screening after hemithyroidectomy
- Post-hemithyroidectomy women who completely missed first-trimester TSH screening
- 29.5%
Adverse obstetric outcomes
- Absolute rates of adverse obstetric outcomes did not differ significantly between cohorts
Safety
- Absolute rates of adverse obstetric outcomes did not differ significantly between cohorts
Original publication
Pregnancy after Hemithyroidectomy: Increased Risk of Gestational Overt Hypothyroidism Despite Favorable Obstetric Outcomes: A Nationwide Study. Thyroid. Published 24 August 2026. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →