Re: TSH blood test- when can I get it after I took medication?
If your free T4 is going to be tested, wait at least 4-6 hours before having blood drawn. If only your TSH will be tested, it doesn't matter.
The list of inert ingredients for all strengths of Synthroid includes -- acacia, confectioner's sugar (contains corn starch), lactose monohydrate, magnesium stearate, povidone, and talc. Then there are various dyes used to color the different strengths.
I'm guessing that cornstarch might be a problem?
Last edited by midwest1; 09-15-2010 at 08:18 AM.