Because there are doctors who will reduce a dose based on the artificially high levels that result when that day's med is taken before the test, I wouldn't risk it.
Is it possible that you could take the first dose in the middle of the night.... perhaps when you rise to use the bathroom? Or maybe you could set an alarm to give you at least 8 hours between the dose and the blood draw?
Here is the URL to a post that Meep wrote last fall explaining dose/blood draw and timing, and a portion of what it says ~
- If you are taking Synthroid or any other T4-only med within 8 hours of a blood test, it will skew your FreeT4 test, but not Total T4, Free T3, Total T3, T3 Uptake or TSH.
- If you are taking Armour (or any combination of T3 and T4) within 8 hours of a blood test, it will skew your Free T3 and Free T4, but shouldn't have an effect on Total T3, Total T4, T3 Uptake, or TSH.
- If you are taking Cytomel within 8 hours of a blood test, it will skew your FreeT3 test, but not Total T3, Free T4, Total T4, T3 Uptake or TSH.