I've read a few times here and in research papers that HotoTC (active B12) is generally up to 20% of serum B12.
Mine is not (in my case: HoloTC = 31% of serum B12), and beyond that my HoloTC is higher than the reference range.
Notes:
*I've never injected B12
*The test (results below) was done 11 days after I've stopped taking 1000mcg Methylcobalamin sublingual 2x a week (I took this for 3 years)
My question: What are the implications of high HoloTc /active B12 (specially when it accounts to more than 20% of serum B12?
My latest results:
* Vitamin B12 (Serum) 366.0 ng/L (187.0 - 833.0)
* Methylmalonic acid 163 nmol/L (0 - 280)
* Active B12 (HoloTC) 113 pmol/L (25 - 108)
* Homocysteine 7.7 umol/l (0.0 - 15.0)
* serum folate 16.0 ug/L (3.1 - 20.5)
Note2: When B12 hit 366 (from 593 - went down in 11 days of no supplementation), I got the following added to my symptoms (all waking me up from sleep):
* numbness and tingling on hands
* restless legs
* face formication
*nerve pain on one palm of the hand (this resolved within 1 hour of me taking a sublingual 1000mcg Methylcobalamin)
The more I research, I do not seem to have a B12 deficiency (despite my symptoms - more in my first post in my profile - and accentuated macrocytosis (which has been deemed "undiagnosed" by haematologist)), but as I continue my research I need further pointers, so writing here as many members have been immensely helpful and have a ton of knowledge to share and I could get some help with pointers to further research to look into.
Note3: For those versed in biochemistry, my B6 is borderline high (I take no B6 supplementation)
* Vitamin B6 (Pyridoxal-5'-phosphate) 109.7 nmol/L (35.2 - 110.1)
Many Thanks!