Re: Should you take your medication before blood work
Your body doesn't make immediate use the med you took up to 6 hours before the blood draw. At that time, there will be extra T4 (and T3, if you take a T3 med) "floating" around "loose" in your bloodstream. That in no way reflects the degree of hypo or hyper you are, because it doesn't show what's going on at the cellular level. That's why it's inaccurate to test that artificially spiked level. People have had their doses unwarrantedly reduced based on the artificially high blood level that follows taking their meds.
If your MD tests only your TSH, take your med when you want; it won't matter.
If he tests your FT4, do not take your levothyroxine or Armour (or other desiccated) before the draw.
If he tests FT3 and if you take Armour (or other desiccated) or Cytomel, don't take it before the draw.
Last edited by midwest1; 12-16-2010 at 07:21 AM.