Open Access Journal of Toxicology Introduction Over the past 20 years, the prevalence of feline hyperthyroidism has increased astoundingly [1-3]. It has become the most common endocrine disorder in cats, and the risk worsens with each year of increasing age, being most common in middle to older-aged felines [1]. The disease is primarily characterized by an excessive production and release of the thyroid hormones thyroxine (T4) and triiodothyronine (T3) most commonly due to a functional, benign adenomatous hyperplasia of the thyroid gland. At present, there is not a feline specific thyroid stimulating hormone (TSH) assay test available, therefore unlike human hyperthyroid diagnosis, veterinarians do not commonly depend on a low TSH value for primary hyperthyroid diagnosis. Hyperthyroidism diagnosis in cats is generally based on a high free T4 level and the presence of clinical signs and symptoms. Some of the clinical complications of hyperthyroidism that may be p...
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