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A diagnosis of vitamin B 12 deficiency is determined by blood levels lower than 200 or 250 picograms per ml (148 or 185 picomoles per liter). [3] Some people can have symptoms with their normal levels of the vitamin, or may have low levels despite having no symptoms. [5] Other tests may be done to ensure individuals status. [3]
Vitamin B 12 deficiency can be found within normal levels, so clinical symptoms should be taken into account when a diagnosis is made. [2] Normal blood levels are considered to be at least above 300 pg/mL in adults. [2] Some researchers have suggested that current standards for vitamin B 12 levels are too low. [152]
Acid–base and blood gases are among the few blood constituents that exhibit substantial difference between arterial and venous values. [6] Still, pH, bicarbonate and base excess show a high level of inter-method reliability between arterial and venous tests, so arterial and venous values are roughly equivalent for these. [44]
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 ...
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.
“Vitamin B12 is necessary for normal processing of carbs, proteins, and fats in the body and for the normal formation of red blood cells,” adds Elizabeth Somer, M.S., R.D.N., a dietitian based ...
[4]: 44 Vitamin B 12 is an essential water-soluble vitamin, the deficiency of which creates anemia (macrocytic anemia), decreased bone marrow cell production (anemia, pancytopenia), neurological problems, as well as metabolic issues (methylmalonyl-CoA acidosis). [4]: 50–51 Vitamin B 12 is therefore an important vitamin for the body to absorb.
Hyperhomocysteinemia is typically managed with vitamin B 6, vitamin B 9 and vitamin B 12 supplementation. [4] Hyperhomocysteinemia is a risk factor for cardiovascular disease; supplements of these vitamins may slightly reduce stroke outcome but not myocardial infarction, death from any cause or adverse events.