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Related Experiment Videos

Serum fructosamine concentration in cats with overt hyperthyroidism.

C E Reusch1, K Tomsa

  • 1Clinic for Small Animal Internal Medicine, Faculty of Veterinary Medicine, University of Zurich, Switzerland.

Journal of the American Veterinary Medical Association
|December 20, 1999
PubMed
Summary

Hyperthyroid cats often have lower serum fructosamine concentrations due to accelerated protein turnover. These levels should not be used to diagnose diabetes mellitus in hyperthyroid cats.

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Area of Science:

  • Veterinary Medicine
  • Endocrinology
  • Clinical Pathology

Background:

  • Hyperthyroidism is a common endocrine disorder in cats.
  • Serum fructosamine is a marker used to assess long-term glycemic control, particularly in diabetic cats.
  • The influence of hyperthyroidism on serum fructosamine levels is not well-established.

Purpose of the Study:

  • To investigate the effect of hyperthyroidism on serum fructosamine concentrations in cats.
  • To determine if hyperthyroidism impacts serum fructosamine independently of blood glucose levels.

Main Methods:

  • A cohort study involving 22 cats with diagnosed hyperthyroidism.
  • Exclusion of cats with abnormal albumin, total protein, or glucose.
  • Comparison of serum fructosamine levels with healthy cats, newly diagnosed diabetic cats, and cats with hypoproteinemia.

Related Experiment Videos

  • Follow-up measurements after carbimazole treatment in a subset of cats.

    • Main Results:

    • Serum fructosamine concentrations were significantly lower in hyperthyroid cats compared to healthy controls.
    • Fifty percent of hyperthyroid cats had values below the normal reference range.
    • Serum fructosamine levels in hyperthyroid cats did not differ from those with hypoproteinemia.
    • Fructosamine levels increased during treatment with carbimazole.

    Conclusions:

    • Low serum fructosamine in hyperthyroid cats may be attributed to accelerated protein turnover, irrespective of glucose levels.
    • Serum fructosamine testing is unreliable for diagnosing diabetes mellitus in cats with overt hyperthyroidism.
    • Fructosamine levels should not be used to differentiate diabetes mellitus from stress-induced hyperglycemia in hyperthyroid cats.