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Related Experiment Videos

Sampling protocol for thyrotropin stimulation test in the dog.

J W Oliver, V Waldrop

    Journal of the American Veterinary Medical Association
    |March 1, 1983
    PubMed
    Summary
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    Thyroid-stimulating hormone (TSH) testing in dogs shows a significant secretory response within 3 hours, with peak levels at 5-7 hours. This method effectively evaluates thyroid function, even with fasting or varied baseline hormone levels.

    Area of Science:

    • Veterinary Medicine
    • Endocrinology
    • Canine Health

    Background:

    • Baseline thyroxine concentrations in dogs can be equivocal.
    • Baseline triiodothyronine concentrations are influenced by numerous factors.
    • Accurate thyroid function evaluation in dogs is crucial for diagnosis and treatment.

    Purpose of the Study:

    • To assess the thyroid gland's secretory response to low doses of thyrotropin (TSH) in dogs.
    • To determine optimal blood sampling times for TSH stimulation tests.
    • To establish TSH stimulation testing as a reliable method for canine thyroid function assessment.

    Main Methods:

    • Administered low doses of thyrotropin (2.5 and 5.0 units) intravenously to dogs.
    • Monitored thyroxine and triiodothyronine concentrations at various time points post-administration.

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  • Evaluated the impact of 12-hour fasting on test results.

    • Main Results:

    • A significant increase in thyroid hormone secretion was observed as early as 3 hours post-TSH administration (P < 0.001).
    • Peak thyroid hormone response occurred between 5 and 7 hours after TSH injection.
    • Fasting dogs for 12 hours did not affect the test outcomes.

    Conclusions:

    • TSH stimulation testing is a highly effective and reliable method for evaluating thyroid function in dogs.
    • Small, economical doses of TSH (2.5-5.0 units) yield significant results.
    • Early blood sampling (as soon as 3 hours) is feasible and advantageous for scheduling.