Title pretty much says it all. I'm hypo, currently taking Vit D amongst many other things, have been doing so for months, and want to re-check my levels. I was taking 5000 i.u. for around 3 months at the end of last year, then switched to 1000 i.u. daily this year. My Vit D was quite low back in August '16, pre-supplementation. My result was:66.1 <50 adequate, <220 high so I had a fair bit of room for improvement. I don't get out in the sunshine much or if I do, I cover up.
Should I quit taking the supplement before I do the blood spot test, and if so, for how long beforehand?