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Primary hypothyroidism in dogs presents nonspecific and systemic clinical signs, which precludes diagnosis only through clinical examination, blood count and routine serum biochemistry. Thus, thyroid function tests, together with clinical signs, should be performed for the definitive diagnosis of this endocrinopathy. Four dogs, one male and three females, aged 4 to 10 years, with clinical signs suggestive of hypothyroidism were evaluated for free T4 (fT4) and canine TSH (cTSH) plasma concentrations. In all dogs diagnosed with primary hypothyroidism, an increase was observed. cTSH concentration and free T4 decrease. As they were treated with sodium levothyroxine, there was an improvement in the reevaluation of TSH and fT4 parameters. Blood count and serum biochemistry were performed to help to rule out comorbidities and diseased euthyroid. Definitive diagnosis and follow-up of primary hypothyroidism treatment should be based on determinations of fT4 and cTSH plasma concentrations. It is recommended to rule out the sick euthyroid condition for successful hormone replacement therapy.

Determinação da concentração plasmática de cTSH no diagnóstico de hipotireoidismo primário em cães: relato de quatro casos