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Related Experiment Videos

Testicular function after 131I therapy for hyperthyroidism.

Claudia Ceccarelli1, Domenico Canale, Paolo Battisti

  • 1Department of Endocrinology, University of Pisa, Pisa, Italy. claudiac@endoc.med.unipi.it

Clinical Endocrinology
|September 21, 2006
PubMed
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Radioiodine-131 (I-131) treatment for hyperthyroidism caused temporary reductions in testosterone and improved sperm motility in men. These effects on male gonadal function were marginal and may be significant for those with pre-existing fertility issues.

Area of Science:

  • Endocrinology
  • Nuclear Medicine
  • Reproductive Health

Background:

  • Radioiodine-131 (I-131) is a standard hyperthyroidism treatment.
  • Limited data exist on I-131's impact on male gonadal function.
  • Previous studies focused on high-dose I-131 for thyroid cancer.

Purpose of the Study:

  • To assess radiation dose to testes during I-131 therapy for hyperthyroidism.
  • To evaluate testicular function in hyperthyroid men post-I-131 treatment.
  • To correlate radiation dose with observed functional changes.

Main Methods:

  • Nineteen male hyperthyroid patients underwent I-131 therapy.
  • Dosimetry study: beta and gamma radiation doses to testes measured using MIRD and TLDs.
  • Clinical study: hormone levels, testicular ultrasound, and sperm analysis performed pre- and post-treatment (12 months follow-up).

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Main Results:

  • Testicular radiation dose: beta 12.5 ± 8.8 mGy, gamma 15.8 ± 5.3 mGy.
  • Serum testosterone and T/LH ratio decreased at 45 days, returning to baseline by 12 months.
  • Progressive sperm motility significantly increased post-I-131 therapy; sperm concentration and normal forms remained unchanged.

Conclusions:

  • I-131 therapy for hyperthyroidism induces only minor, transient changes in germinal epithelium and Leydig cell function.
  • These changes may be more relevant for individuals with pre-existing fertility impairments.
  • The study provides valuable data on testicular dosimetry and function following I-131 treatment for hyperthyroidism.