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The danger in relying on free T4 measurement by equilibrium dialysis to diagnose feline hyperthyroidism.
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“Some euthyroid older cats have elevated free T4 concentrations measured by equilibrium dialysis. Thus, initially measuring free T4 by equilibrium dialysis as a screening test for hyperthyroidism in older cats can lead to false positive results.”
-David S. Bruyette, DVM, DACVIM
From Choosing the best test to diagnose feline hyperthyroidism
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