Yes both tests should be done, a T4 is the standard test, the Free
T4 is the one that is used if the other is normal but thyroid is
suspected, that is how we caught Fred's so early, he was always normal
on the T4, but he had tiny lump on his thyroid we were monitoring for
about a year and my vet felt it had grown a tiny bit so we did the Free
T4 and he was very early hyperthyroid and had the radio iodine treatment.
--
Belinda
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