Equilibrium dialysis (ED) is considered the gold standard methodology when measuring Free-T4 in dogs and cats.
Recent reports indicate that alternative methods for measuring Free-T4 may not offer any significant advantage over measuring TT4 alone, especially in dogs with non-thyroidal illness.*
Despite recent logistical issues and increased costs, Gribbles Veterinary will continue to offer this valuable diagnostic test (Free-T4 ED), but on a fortnightly rather than weekly basis. The price will remain the same as listed in our current price book.
* Bennaim M. et al. Free thyroxine measurement by analogue immunoassay and equilibrium dialysis in dogs with non-thyroidal illness. Res. in Vet Sci. 147:37-43, 2022.