Re-testing Vit D - do I need to leave off suppl... - Thyroid UK

Thyroid UK

137,148 members160,828 posts

Re-testing Vit D - do I need to leave off supplement, if so for how long?

4 Replies

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?

Read more about...
4 Replies
SeasideSusie profile image
SeasideSusieRemembering

Hidden You don't need to leave D3 supplements off for any length of time, just don't take it on the morning of the test, maybe the day before as well.

City Assays has a video about the test and I think towards the end it tells you vitamindtest.org.uk/index.html

Recommended level is 100-150nmol/L.

in reply to SeasideSusie

Thanks SeasideSusie, yes they do indeed say just don't take Vit D on the morning of your test, so that's cleared that up. :)

bluebug profile image
bluebug in reply to

I wouldn't take it 24 hours before the test just to be on the safe side.

I have had one false reading for a vitamin D test but I was on a very high dose.

in reply to bluebug

Thanks bluebug, will do! :)

You may also like...

How much Vit D supplement to take?

50-74 so I have decided to take a supplement. My question is how much to take. I have Solgar D3,...

More research /labelling needed for Vit D supplements

symptoms over the past 3 months that have all totally gone since stopping D supplements over the...

Can someone clarify re vit D/magnesium supplements please?

regards supplements, but can't find exactly what I'm looking for, so I hope I'm not repeating too...

Vit D supplementation

already been taking more than that for the last 6 months. I have some better you D+K2 3000iu(1...

Do I need to take a vitamin D supplement?

with Graves and have just had the results of the vit D test I asked for. GP has said no further...