Often times the first few times that thyroid labs are done, they end up having a "normal" result.
I have a really good friend who started complaining about thinning hair, weight gain, constipation, forgetfulness ect.... I told her then to have her doctor check her thyroid levels as it sounded to me like she was suffering with hypothyroidism. Well she did, and her level came back at the high end of normal.
I told her to keep an eye on her symptoms and make sure the doctor tests again later. I told her to insist on it. She followed my advise and sure enough, 6 months after the first test, her level was off.
My surgeon ordered a ton of pre op labs and they included thyroid levels. I am sure that most surgeons do, but you may want to call your surgeons office and ask. If I was you I would get it tested before then so that if it is the problem you can get started on medication.
Off thyroid levels can and will contribute to slow healing from any illness or surgery.
Missy