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The danger in relying on free T4 measurement by equilibrium dialysis to diagnose feline hyperthyroidism.
“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