I'm finding it difficult to see what low serum but "Normal" active b12 really means.
I'm due back at the doctors to state my case for treatment but read on certain sites that an active b12 above 50 requires no treatment.
Why would serum be low (153pg/ml) but active be normal (67.8pmol/l).
My symptoms are pretty much text book b12 deficiency but I do appreciate that lots of other things cause similar symptoms.
I've had some great help on here but this is the one thing I can't seem to get a grasp of.
I had a low b12 serum test in 2012 (146) but no follow up or active test at the time because a second test came back as 287 because i'd started to self treat with sublingual b12 without realising it effects results. (I stopped it after being told the second test was normal).
Why would serum be low but active be considered normal?
You can see a more detailed account of my history and results on my previous post.
Ps those results are from the end of October and I've been using sublingual methyl b12 since the first week in November.