Took my senior cat to the vet - hyper thyroid?

I had posted a few days ago, and people gave me really great advice on what vaccinations my cat might or might not need. I appreciated all the advice very much, and was able to bring notes with me to the Vet.

The only vaccine my cat needed this year is the Purevax rabies one, because it is required by law. She is doing fine this evening and I'm glad. Last year she got more shots and got sick.

They did blood work on her - all organs are working fine. The only concern the Vet called me with is that she is in the gray zone and has mild "high-normal thyroid"? I'm reading off my notes so I hope that makes sense. She said that the gray zone is 2.3-4.7 and my cat has 2.3. She says this might suggest early thyroid problems and that they could do a test for that, with the blood they already have.

She said one of the symptoms could be vomiting (and other things) and my cat has been vomiting at least once a week - not furballs - but food. So I think I really should have the test taken and call them tomorrow to go ahead.

I'm just wondering if your cat has it, and how it is treated...do you give them a pill every day for it, or something else?

Finances are really tight, as many people are experiencing, and today's visit was delightfully cheaper then I expected. So taking this test will make the bill what I originally imagined. So it's feasible and I want to address any problems as soon as possible.

I really appreciate everyone on the forums. Thanks so much.

Her name is Hannah. A friend of mine gave her to me when she was 2 and now she's 10. The Vet says things seem ok...because she has actually gained weight since her last visit. She weighed 9.9 and now she weighs 10.2. But I still want to get the test to know for sure.

What are the most common causes for cats to throw up food? She does that once a week or so.

Thanks so much for the info.

Occasionally she will throw up the long tube thing and it's obviously fur because when I pick it up it's very light. Other times it's food that has started digesting and it really smells bad...

I had posted once because she was vomiting and someone said it could happen if I give her too much dry food...as it expands...so I stopped doing that. She vomits maybe once or twice a week...but it has been a few weeks, now that I think about it. She usually does it in the middle of the night and I have to get up and clean it...

She eats the same food all the time, she is on a limited diet because she has allergies.