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Normal adult: 0.2 [84] 0.5 [84] ng/dL 3.1 [86] ... Standard range Optimal range Unit Lower limit ... Vitamin B 12 (Cobalamin) 130, [129] 160 [130] 700, ...
Serum vitamin B 12 is a medical laboratory test that measure vitamin B 12 only in the blood binding to both transcobalamins. [1] Most of the time, 80–94% of vitamin B 12 in the blood binds to haptocorrin, while only 6–20% is binds to transcobalamin ll. [2] Only transcobalamin ll is "active" and can be used by the body. [1]
Vitamin B 12 was discovered as a result of pernicious anemia, an autoimmune disorder in which the blood has a lower than normal number of red blood cells, due to a deficiency of vitamin B 12. [ 5 ] [ 16 ] The ability to absorb the vitamin declines with age, especially in people over 60.
Lack of vitamin B12 can cause megaloblastic anemia—a condition characterized by larger than normal red blood cells in a smaller than normal amount. This causes fatigue, paleness in the skin ...
Again, the daily recommended dietary allowance of vitamin B12 for most adults is 2.4 micrograms, stretching up to 2.6 and 2.8 micrograms if you’re pregnant or nursing.
US RDA for vitamin B12 for adults [45] 10 −8: 10 −8 kg: Speculated approximate lower limit of the mass of a primordial black hole: 1.5 × 10 −8 kg: US RDA for vitamin D for adults [46] ~2 × 10 −8 kg Uncertainty in the mass of the International Prototype of the Kilogram (IPK) (±~20 μg) [47] 2.2 × 10 −8 kg
The Good Housekeeping Institute tested more than 30 brands of B12 supplements, and chose Nature made B12 1000mcg as the best overall option, and Garden of Life Vitamin Code Raw B12 as the best ...
The prevalence of vitamin B 12 deficiency increased substantially in the elderly, where 31% of the elderly had vitamin B 12 levels below 130 pmol/L. In the most recent NDNS survey conducted between 2008 and 2011, serum vitamin B 12 was measured in 549 adults. [162]
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