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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 ...
In the body, homocysteine can be recycled into methionine or converted into cysteine with the aid of vitamin B 6, B 9, and B 12. [3] 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.
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]
High blood levels of homocysteine have been linked to Alzheimer’s disease and other forms of dementia. Butternut squash Winter squashes such as butternut squash, acorn squash, and pumpkin are ...
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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]
Patients exhibit developmental delay, motor and gait dysfunction, seizures, and neurological impairment and have extremely high levels of homocysteine in their plasma and urine as well as low to normal plasma methionine levels. This deficiency and mutations in MTHFR have also been linked to recessive spastic paraparesis with complex I deficiency.
There is an association between the blood levels of homocysteine and thrombosis, [16] although this has not been reported consistently in all studies. [5] Homocysteine levels are determined by mutations in the MTHFR and CBS genes, but also by levels of folic acid, vitamin B 6 and vitamin B 12, which depend on diet. [14]