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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 ...
The recommended maximum daily intake of sodium – the amount above which health problems appear – is 2,300 milligrams per day for adults, about 1 teaspoon of salt (5.9 g). The recommended adequate intake of sodium is 1,500 milligrams (3.9 g salt) per day, and people over 50 need even less."
Most adults need 2.4 micrograms of vitamin B12 a day, although the numbers are slightly higher during pregnancy and breastfeeding. Causes of vitamin B12 deficiency There are a few reasons why ...
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.
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. [161]
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