Important Information regarding referring a patient for I-131 therapy

  1. Your pre-therapy workup: CBC, Complete Chemistry screen, diagnostic T4 by an outside lab (ie Antech or Idexx), thoracic radiographs within 30 days of the treatment. Urinalysis is highly recommended. If the patient is currently on Tapazole/PTU or Y/D Diet – and has been for more than 30 days – we require a T4 taken seven days after cessation of this medication. Radiocat personnel can suggest a schedule for stopping, being retested, and arriving for therapy. Please supply all previous T4 values, histories for biopsies, cancer, and acute episodes.

  2. Patients MUST be off Tapazole/PTU or Y/D Diet for at least seven days prior to admission for I-131 therapy. Other medications which may interfere with therapy include: ACTH, anticoagulants, antihistimines, antiparasitics, bromides, butazolidine, mercurials, nitrates, penicillin, pentothal, salicylates (large doses), sulfonamides, thiocyanate, and some vitamin preparations.

  3. Patients are admitted for therapy by appointment only.

  4. Patients are hospitalized in the nuclear medicine ward for approximately 3-5 days. Clients cannot visit patients during therapy, nor can patients be removed from the ward until officially released. Clients cannot terminate therapy or arrange for early release once therapy has begun. We’re sorry, but these rules are dictated by federal guidelines on radiation safety.

  5. After admission for I-131 therapy, information on a patient’s daily status will be given by Radiocat personnel.

  6. I-131 therapy includes:

    • Review of all pertinent case records and radiographs.

    • Hospitalization in the nuclear medicine ward.

    • Radioisotope (I-131) and appropriate radiation monitoring.

    • Daily care and feeding (and as much love as we can safely give).

    • As needed follow-up consultations regarding test results between Radiocat and the referring veterinarian.

  7. I-131 Does NOT include:

    • Diagnostic tests performed at your clinic prior to therapy.

    • Emergency medical tests, procedures or medications needed during the patient’s hospitalization for therapy.

    • Post-therapy T4 determination performed at your clinic.

  8. Patients are released to owners according to strict federal regulations. Patients will be excreting a small amount of Radioiodine on release. Clients are instructed before admission – and given written instructions – on the handling of patients for two weeks post-release from therapy. If clients are unable/unwilling to comply with these precautions, they should consider surgical or medical management.

  9. Possible but very rare complications of Radioiodine therapy include:

    • Possibility for patient to become hypothyroid. Rare cases may need exogenous thyroid supplement.

    • Possibility for sore throat or dysphagia. This is usually transient, but a permanent voice change is possible.


We’re excited to help you offer this service to your clients, and we know they’ll be grateful for the care and concern you’ve shown in finding a cure for their pet’s Hyperthyroidism.


Thank you again for your support.

OakVet Animal Specialty Hospital Inc.

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ph. 510-879-4888 | fax 510-905-0044

1133 7th St, Oakland, CA, 94607