of 4-6 weeks should elapse before critically assessing the cat ’ s clinical response to treatment . Subsequent reevaluations should include history , physical examination and measurement of serum thyroid hormone concentrations . The goal of therapy is to resolve the clinical signs of hypothyroidism while avoiding signs of hyperthyroidism . This can usually be accomplished by maintaining serum T4 concentration between 1.0 and 3.0 ug / dL . The dosage and frequency of levothyroxine may need modification to achieve these goals . If serum thyroid hormone concentrations are normal after 4-6 weeks of treatment but there is no clinical response , the clinician should reassess the diagnosis . hypothyroidism should be normal . Most , if not all , of the clinical manifestations resolve following thyroid hormone supplementation . The prognosis for kittens with congenital hypothyroidism is guarded and depends on the severity of skeletal changes at the time treatment is initiated . Although many of the clinical signs resolve with therapy , musculoskeletal problems may persist or develop as a result of abnormal bone and joint development . ■
The prognosis for feline hypothyroidism depends on the underlying cause and the age of the cat at the time clinical signs develop . With appropriate therapy , the life expectancy of an adult cat with primary