White Haven Veterinary Hospital

88 State Route 940
White Haven, PA 18661



Does your Cat suffer from Hyperthyroidism?  Tired of fighting to get in medication?

We have the answer

Feline Radioactive Iodine Therapy

Also known as:   I - 131

  • I-131 is a calculated injection of radioactive iodine administered subcutaneously or under the skin in a veterinary hospital. It is considered the treatment of choice for Feline Hyperthyroidism by experts.
  • How it works: The thyroid gland concentrates iodine. After administration of I-131, the thyroid gland takes up the radioactive iodine, which emits radiation particles that selectively destroy the abnormal thyroid tissue without damaging other tissue.
  • Feline Hyperthyroidism (FHT) is the most common endocrine disorder in US middle age to older cats (up to 10% of cats greater than 10 yrs old and up to 11.4% of older cats worldwide). It is a relatively recent disease that was first described around 1979-1980. I-131 therapy began in the early 1990s. Treatment depend on many factors some such as: age, comorbidities, cost, and availability of treatment options.

I-131 Advantages:

  • No anesthesia is required
  • No daily medication
  • Does not destroy healthy tissue
  • Does not damage other tissue or organs, including the parathyroid glands
  • Returns thyroid function to normal usually within 1 to 3 months

I-131 Disadvantages:

  • Hospitalization (3-5 days) with no owner visits and only signed off trained staff following Isolation SOP to attend to patient
  • 2 weeks “house arrest” for cats once discharged with only short cuddling by owners; can’t be around pregnant women or children up to 16 years of age for the 2 weeks.
  • Litter must be either flushed daily or collected and stored for 3 months before disposing into garbage
  • Up front cost is high but no additional thyroid blood tests over the years or medication charges