The vitamin B.sub.12 (cobalamin) level of human blood and mammalian tissue is routinely assayed utilizing radioisotope dilution assay (RIDA) techniques. The presence of vitamin B.sub.12 analogues in most such samples, which analogues are erroneously assayed as true vitamin B.sub.12 utilizing ...
By building such structured information, hemodialysis patients and pregnant women have emerged as those groups preferentially requiring B₁₂ testing, as it may potentially improve the clinical outcome. To avoid misinterpretation of B₁₂ results more care should be taken in considering its ...
B-12 is a very large molecule. To extract it from protein (and digest the protein) the stomach must secrete adequate amounts of acid plus the digestive enzyme pepsin. This may be a problem for older people; 20-30 per cent do not produce enough acid and may explain why 11 per cent of...
L. et al. Monitoring of vitamin B-12 nutritional status in the United States by using plasma methylmalonic acid and serum vitamin B-12. Am. J. Clin. Nutr. 94, 552–561 (2011). Google Scholar Yang, Q. et al. Folic acid source, usual intake, and folate and vitamin B-12 status ...
Substances Added to Food (formerly EAFUS) VITAMIN B-12 SCOGS (Select Committee on GRAS Substances) Vitamin B12 (cyanocobalamin) NCI Dictionary of Cancer Terms cyanocobalamin FDA UNII P6YC3EG204 NCI Drug Dictionary Berubigen ATC code B03BA01,B03BA51 EPA Substance Registry System Vitamin...
Our data suggest that 27.27% of the total enrolled patients had occult vitamin B12 deficiency despite normal to elevated vitamin B12 levels on regular serum vitamin B12 testing. 展开 关键词: Cobalamin Methylmalonic acid Myeloproliferative disorders Vitamin B12 ...
The authors concluded that there is insufficient evidence of an effect of vitamin B-6, B-12, or folic acid supplementation, alone or in combination, on cognitive function testing in people with either normal or impaired cognitive function. This is in agreement with Clarke et al (2007) who ...
Results: Low total vitamin [B.sub.12] (<148 pmol/L) and low holoTC (<35 pmol/L) were observed in 6.5% and 8.0%, and increased methylmalonic acid (>350 nmol/L) and homocysteine (>13 [micro]amol/L) were observed in 12.1% and 17.0% of the study participants. In multiple ...
Vitamin D testing: what's right for your lab? In a study of about 3,500 patients who underwent operations other than heart surgeries, researchers found that vitamin D concentrations were associated with rates of "in-hospital death, serious infections and serious cardiovascular events," according ...
(nutrient) intake, but may also arise from impaired absorption, increased turnover, and excretion, increased tissue demand, etc. Deficiency signs are directly observable; symptoms can be elicited by testing, and the response of these to interventions (e.g., nutrient supplementation) can help to ...