Radioactive iodine treatment for feline hyperthyroidism is highly effective but requires careful post-treatment monitoring of thyroid function and renal welfare to optimise long-term outcomes.
Post-radioiodine monitoring welfare represents the critical phase where the benefits of excellent treatment can be maximised or inadvertently compromised. The key welfare concern is that normalising thyroid function reveals previously masked chronic kidney disease in some cats. These cats may experience a deterioration in kidney function post-treatment that reduces their overall quality of life compared to managed hyperthyroidism. Regular post-treatment monitoring enables early detection and appropriate management of hypothyroidism or emerging kidney disease. The welfare-optimal approach integrates thyroid and renal monitoring with quality of life assessment to ensure the treatment serves the cat's overall wellbeing rather than just normalising a single biochemical parameter.