TSH Measurement in Senior Cats – A Prospective Study.

Wakeling J., Elliott J. and Syme H.

Journal of Veterinary Internal Medicine, 2008. 22(3): p.725.

Hyperthyroidism is a common disease of older cats and is insidious in onset. In a retrospective study most hyperthyroid cats were found to have had undetectable TSH concentrations (<0.03 ng/ml) 1–3 years prior to diagnosis. Also, euthyroid cats with TSH <0.03 ng/ml reportedly have a higher frequency of thyroid adenomas and/or hyperplastic nodules than cats with TSH >0.03 ng/ml. The purpose of this prospective longitudinal study was to document the frequency with which hyperthyroidism is diagnosed in cats with differing TSH measurements.