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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]
A blood test can be performed to quantify total homocysteine concentration in the plasma, of which approximately 80% is generally protein-bound. Classification of hyperhomocysteinemia is defined with respect to serum concentration as follows: [citation needed] Moderate: 15–30 nmol/mL (or μmol/L) Intermediate: 30–100 nmol/mL; Severe: > 100 ...
Diagnosis is supported based on vitamin B 12 blood levels below 150–180 pmol/L (200–250 pg/mL) in adults. [51] However, serum values can be maintained while tissue B 12 stores are becoming depleted. Therefore, serum B 12 values above the cut-off point of deficiency do not necessarily confirm adequate B 12 status. [2]
A vitamin B12 level of less than 200 pg/mL is considered deficient. Treatment First, have your health care provider run blood tests to see if you truly have a B12 deficiency.
“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 ...
For megaloblastic macrocytic anemias, useful tests may include serum levels of Vitamin B 12, methylmalonic acid, and homocysteine. [1] In the absence of Vitamin B 12 or folate deficiency, alternative causes of megaloblastic anemia include copper deficiency , medications, and certain inborn errors of metabolism.
Vitamin B12 does also accumulate in a few plant-based sources, including some mushrooms, seaweed, and nutritional yeast, but not enough to fortify vegans, who, in particular, should consider being ...
High levels of homocysteine in the blood (hyperhomocysteinemia) is regarded as a marker of cardiovascular disease, likely working through atherogenesis, which can result in ischemic injury. Therefore, hyperhomocysteinemia is a possible risk factor for coronary artery disease.
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