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J Feline Med Surg. 2009 Apr;11(4):315-21. doi: 10.1016/j.jfms.2008.08.001. Epub 2008 Oct 10.

Prevalence of and risk factors for feline hyperthyroidism in Hong Kong.

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Department of Companion Animal Clinical Studies, Section of Small Animal Medicine, Faculty of Veterinary Science, University of Pretoria, South Africa.


A study was conducted to determine the prevalence of and potential risk factors for feline hyperthyroidism in Hong Kong. Serum total thyroxine (T(4)) was measured in 305 cats aged 10 years and older that presented at various veterinary clinics in Hong Kong. The prevalence of hyperthyroidism (T(4)>50 nmol/l) within this population was 3.93% and there was no significant difference in prevalence between healthy (3.16%) and sick (4.37%) cats. Older cats (>15 years) were more likely to be affected and domestic shorthair cats were less likely to be diagnosed with hyperthyroidism than the other breeds combined. No specific association between the development of feline hyperthyroidism and food type was observed. The prevalence of feline hyperthyroidism in Hong Kong was less than that reported for most other parts of the world, despite the presence of previously identified risk factors.

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