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Relationship between semi-quantitative thyroid palpation and total thyroxine concentration in cats with and without
G D Norsworthy1, V J Adams, M R McElhaney
1Alamo Feline Health Center, San Antonio, TX 78232, USA.
Journal of Feline Medicine and Surgery
|October 4, 2002
Summary
Thyroid palpation in cats is a useful diagnostic tool for hyperthyroidism. Enlarged thyroid glands (score >3) strongly indicate hyperthyroidism, aiding in diagnosis when combined with total thyroxine (TT4) levels.
Area of Science:
- Veterinary Medicine
- Endocrinology
- Diagnostic Imaging
Background:
- Hyperthyroidism is a common endocrine disorder in cats.
- Accurate diagnosis relies on correlating clinical signs with diagnostic tests.
- Thyroid palpation is a common but subjective diagnostic method.
Purpose of the Study:
- To evaluate the efficacy of a semi-quantitative thyroid palpation technique in diagnosing feline hyperthyroidism.
- To compare palpation findings with total thyroxine (TT4) concentrations.
- To establish a scoring system for thyroid gland size to aid in diagnosis.
Main Methods:
- 155 cats, with and without hyperthyroidism, underwent thyroid palpation.
- Thyroid glands were scored from 0 (non-palpable) to 6.
- Palpation scores were compared to total thyroxine (TT4) concentrations.
Main Results:
- 23 of 155 cats were classified as hyperthyroid based on TT4.
- Enlarged thyroid glands (score >0) were detected in 22/23 hyperthyroid cats and 78/132 euthyroid cats.
- Hyperthyroid cats were more likely to have higher thyroid lobe scores (≥4) than euthyroid cats.
Conclusions:
- Thyroid palpation, particularly with scores of 4 or greater, is a valuable aid in diagnosing feline hyperthyroidism.
- The semi-quantitative scoring system improves the diagnostic utility of physical examination.
- Palpation combined with TT4 measurements offers a reliable diagnostic approach.