Hi, I've come from the Thyroid UK community: one of the administrators suggested I post a query about vitamin B12 testing here and I would be very grateful for any comments. I recently had an active vit B12 test (Blue Horizon) at the same time as an ordinary one (included in a test for various other things as well). I have had palpitation problems since early December and have been on T3 only (successfully) for the past seven years. Trying to work out what is causing the palps (I'm under cardiac investigation), I've been gluten free for about four months and am not supplementing vit B12, ferritin or folate.
I had a serum vit B12 test in May 2015 which was 404ng/L (160 - 900)
The recent active B12 test was 120pmol/L (25.1 - 165) [equiv to 162.6ng/L]
The recent serum B12 test was 383pmol/L (250 - 750) [equiv to 519ng/L]
So my vit B12 levels have definitely improved, as have ferritin (131ug/L) and folate (7.93ug/L). My question is, as my active result is good but my serum level not great should I be supplementing vit B12?