8/8/2023 0 Comments Normal thyroid levelsTgA positive dogs may have falsely elevated Free T4 Immulite results, so should always be tested using the free T4 by dialysis method available for other species.įree T4 by equilibrium dialysis is the only Free T4 test method we use for cats and horses. Moreover, serum TSH levels at the upper limit of the normal range have been found in obese adults and have been positively correlated with body mass index. TgA (thyroglobulin autoantibody) testing is only available for dogs.įree T4 is available by Immulite or by equilibrium dialysis for dogs. Variations in thyroid function within the reference range have been associated with body weight in several cross-sectional and longitudinal studies. TSH testing is available only for dogs and cats. Taking into consideration the animal's history and results of the physical examination and other laboratory tests, possible interpretations are as follows: Supplements high in iodine or containing kelp may cause high thyroid levels and occasionally signs of hyperthyroidism.Īnti-inflammatories, steroids, chronic illness, dietary supplements, and a variety of other factors may affect thyroid function. A few true hyperthyroid horses have been documented. Horses seldom have primary hypothyroidism, but often have hypothyroidism secondary to equine metabolic syndrome (EMS) or pituitary pars intermedia dysfunction (PPID, Cushing’s syndrome). Cats with a low total protein due to liver or kidney disease may have falsely elevated free T4 levels. The free-T4 test may be a useful additional test in cats that are clinically hyperthyroid, but have normal total T3 and/or total T4 concentrations. Thyroglobulin autoantibody (TgA) testing is recommended for dogs with a breed predilection for autoantibody problems or those with unexpectedly high T3 or T4 values. TSH is normal in many abnormal dogs, so we recommend measuring it in combination with other thyroid function tests. Measurement of free-T4 may be useful in differentiating dogs with true hypothyroidism from dogs with reduced thyroid function due to other chronic illness (e.g., hyperadrenocorticism, liver disease, diabetes), drug administration (e.g., glucocorticoids), and malnutrition. The following table contains possible interpretations of various thyroid states for dogs, cats, and horses.
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