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Related Experiment Videos

Serum thyroid hormone concentrations fluctuate in cats with hyperthyroidism.

M E Peterson1, T K Graves, I Cavanagh

  • 1Department of Medicine, Animal Medical Center, New York, NY 10021.

Journal of Veterinary Internal Medicine
|July 1, 1987
PubMed
Summary

Thyroid hormone levels in cats fluctuate significantly, exceeding typical lab variations. A single normal test result doesn't rule out feline hyperthyroidism in symptomatic cats.

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Area of Science:

  • Veterinary Medicine
  • Endocrinology
  • Companion Animal Health

Background:

  • Feline hyperthyroidism is a common endocrine disorder in older cats.
  • Accurate diagnosis relies on measuring serum thyroid hormone concentrations, primarily thyroxine (T4) and triiodothyronine (T3).
  • Understanding the variability of these hormone levels is crucial for accurate diagnosis and management.

Purpose of the Study:

  • To quantify the fluctuation of serum thyroxine (T4) and 3,3',5-triiodothyronine (T3) concentrations in hyperthyroid cats.
  • To compare the observed hormone level variations with standard assay coefficients of variation (CVs).
  • To determine if a single normal T4 or T3 measurement can exclude a diagnosis of feline hyperthyroidism.

Main Methods:

  • Serum T4 and T3 concentrations were measured hourly for 10 hours in 14 hyperthyroid cats.

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  • Serum T4 and T3 concentrations were measured daily for 15 days in seven hyperthyroid cats.
  • Calculated coefficients of variation (CVs) for T4 and T3 were compared to intra-assay CVs.

    • Main Results:

    • The 10-hour study showed serum T4 CVs ranging from 6.4-22.6% (mean 12.0%) and T3 CVs from 9.6-33.1% (mean 17.5%).
    • The 15-day study revealed serum T4 CVs from 6.6-34.8% (mean 18.4%) and T3 CVs from 7.8-31.0% (mean 20.1%).
    • Observed CVs were significantly higher than intra-assay CVs (T4: 5.1%, T3: 7.7%), and some mildly hyperthyroid cats had normal values intermittently.

    Conclusions:

    • Serum T4 and T3 concentrations exhibit significant fluctuation in hyperthyroid cats, exceeding typical assay variability.
    • Mildly hyperthyroid cats may present with normal T4 and T3 values at certain measurement times.
    • A single normal serum T4 or T3 measurement should not preclude a diagnosis of feline hyperthyroidism in clinically suggestive cases.