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As a consequence of the biochemical reactions in which homocysteine is involved, deficiencies of vitamin B 6, folic acid (vitamin B 9), and vitamin B 12 can lead to high homocysteine levels. [2] Other possible causes of hyperhomocysteinemia include genetics, excessive methionine intake, and other diseases.
Total plasma homocysteine. Homocysteine levels typically are higher in men than women, and increase with age. [15] [16] Common levels in Western populations are 10 to 12 μmol/L, and levels of 20 μmol/L are found in populations with low B-vitamin intakes or in the elderly (e.g., Rotterdam, Framingham). [17] [18]
Methylenetetrahydrofolate reductase deficiency is the most common genetic cause of elevated serum levels of homocysteine (hyperhomocysteinemia). It is caused by genetic defects in MTHFR, which is an important enzyme in the methyl cycle. [1] Common variants of MTHFR deficiency are asymptomatic and have only minor effects on disease risk. [2]
Blood tests may show low levels of vitamin B 12, elevated levels of methylmalonic acid or homocysteine, and a routine complete blood counts may shows anemia with an elevated mean cell volume. [141] The presence of antibodies to gastric parietal cells and intrinsic factor may indicate pernicious anemia. [2]
ADMA's role has been linked with elevated levels of homocysteine. [ 6 ] [ 7 ] [ 8 ] Whilst approaches at modifying the latter with oral supplements of folic acid were strongly suggested, studies have shown this fails to give any clinical benefit and suggested that B vitamins might instead increase some cardiovascular risks.
For most substances presented, the optimal levels are the ones normally found in the population as well. More specifically, optimal levels are generally close to a central tendency of the values found in the population. However, usual and optimal levels may differ substantially, most notably among vitamins and blood lipids, so these tables give ...
A deficiency in these B-vitamins, particularly B6, B12, and folate, is associated with elevated homocysteine levels, which increase the risk of alzheimer's disease and dementia. Increased intake of these vitamins can lower homocysteine levels and reduce the risk of these conditions. [173]
"Providers are encouraged to consult with their local lab(s) to obtain hormone level reference ranges for both 'male' and 'female' norms, [which can vary,] and then apply the correct range when interpreting results based on the current hormonal sex, rather than the sex of registration."