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Diagnostic Testing Service
Free Thyroxine, Free T4 (ECB003)
Free Thyroxine (Free T4)
Specimen type
Serum
Contents
Reference range: 0.57-2.93 ng/dL
Free Thyroxine is the biologically active form of the T4 hormone and most accurately reflects thyroid function in dogs.
Hypothyroid dogs have low serum concentrations of free T4.