I'm gonna tell you not to worry.
When we found out about Angus's thyroid the vet found some oddities in his bloodwork (thinking he may have some type of cancer) and did different tests, heck we even took him to have an ultrasound and they couldn't find anything wrong besides his thyroid.
So don't worry, I just know it's not going to turn up anything bad.

Lots of {{{HUGS}}} headed your way