Graves T.K. and Peterson M.E.
Vet Clin North Am Small Anim Pract, 1994. 24(3): p.567-76.
Until recently, the diagnosis of hyperthyroidism in cats was thought to be simple; however, not all cases of the disease are straightforward. Although single resting serum thyroid-hormone determinations may well be adequate to confirm the diagnosis, in many cases, the diagnosis of feline hyperthyroidism requires more extensive investigation.