Well, good news! I finally got the results back today from the full thyroid panel and Beth is not hypothyroid. T4 and FT3 were a little low but not extremely, FT4 was in the normal range, TSH low in the normal range, no significant antibody levels. There was an interpretation with it that said there was no reason to suspect hypothyroidism from those results for a greyhound. Not a surprise, as she really shows no signs, but a relief to know.
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But darn that test was a lot of money to confirm she didn't have something we didn't think she had anyway!