Re: Thyroid cancer scan
That sounds confusing. Perhaps it's just a follow up scan. Were you on meds for the first scan?
I assume "withdrawal" means withdrawing from medication---I could be wrong, I never heard that lingo. When your tsh is high, such as 30, any thyroid tissue left in your body will suck up iodine for the scan, so they can see if there's any spread or remaining tissue.
I don't understand why this timing? Did you have an RAI treatment yet to ablate any remaining tissue?
Also, they don't need to do "withdrawal" scans from medication anymore, because there is a medication approved by the FDA called "Thyrogen" and it means you can stay on synthroid, not feel sick, and get the tsh raised by the thyrogen.
Either way, make sure while your tsh is high that they take a thyroglobulin test, and also, two weeks prior to the scan you should go on the low iodine diet to make the scan more accurate.