Does anyone out there know how fasting affects a Free T4 reading? My Simon had blood work done. His T4 (RIA) was in range with 2.79 out of .8 to 4. But his Free T4 was 90.8 with a range of 10-50. He wasn't fasting, but seems odd that one would be in range and not the other. Also, he's showing no signs at all of hyperthyroidism at the moment.
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Free T4
- Thread starter taxcatkim
- Start Date
Fasting does not usually affect the T4 in any way. It's possible that it's in the beginning stages, or your cat isn't showing any of the typical symptoms in an obvious way. I would maybe repeat the test to be sure, then if it's still high, start the medication and re test in 30 days.
- Thread Starter Thread Starter
- #3
Thanks Sandie. That's my thought - that it's in the early stage, especially since he's not lost any weight or isn't hovering over the water dish. We'll retest for sure and if it ends up being hyperthyroid, I'm thankful that we did catch it early.
Thanks again.
Kim
Thanks again.
Kim
