Homocysteine and methylmalonic acid in diagnosis and risk assessment from infancy to adolescence
Open accessAbstract
The concentration of total homocysteine (tHcy) in serum and plasma is elevated in both folate and cobalamin deficiencies, whereas methylmalonic acid (MMA) in serum, plasma, or urine is a specific marker of cobalamin function. The combined measurement of both metabolites is useful for the diagnosis and follow-up of these deficiency states. In addition, tHcy is elevated under various pathologic states (eg, renal failure), and hyperhomocysteinemia is associated with an increased risk of cardiovascular disease, cognitive dysfunction, and adverse pregnancy outcomes. The diagnostic utility of tHcy and MMA concentrations as markers of folate and cobalamin deficiencies in healthy and diseased children has been documented. This article briefly summarizes the biochemical background of tHcy and MMA and the associations of tHcy and MMA with various disease states and focuses on novel data obtained in infants, children, and adolescents, with emphasis on cobalamin status in infants. The utility of tHcy and MMA as indicators of cobalamin and folate deficiencies in adults can be extended to infants and older children. Furthermore, as in adults, tHcy is related to unhealthy lifestyle factors and is a risk factor for vascular disease. High MMA concentrations in newborns, occasionally denoted as benign methylmalonic aciduria, may reflect impaired cobalamin function.
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The functional markers tHcy and MMA have been established as useful indicators of vitamin B-12 status and may be more sensitive indicators of mild vitamin B-12 deficiency.
“However, the functional markers total homocysteine (tHcy) 13 and methylmalonic acid (MMA) have been established as useful indicators of vitamin B-12 status (13) and may be more sensitive indicators of mild vitamin B-12 deficiency (14,15).”
From Vitamin B-12 status in infancy is positively associated with development and cognitive functioning 5 y later in Nepalese children (2017) · cites this paper as [15]
Elevated tHcy values in these children could not be caused by folate deficiency but rather poor cobalamin status.
“the elevated tHcy values in these children could not be caused by folate deficiency but rather poor cobalamin status (14,15).”
From Vitamin B-12 status in infancy is positively associated with development and cognitive functioning 5 y later in Nepalese children (2017) · cites this paper as [15]
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- Authors
- Bjørke Monsen, A. L., & Ueland, P. M.
- Affiliations
- University of Bergen (NO)
- Corresponding author
- Ueland, Per Magne
- ORCID
- Ueland, Per Magne
- Venue
- The American Journal of Clinical Nutrition
- Publisher
- Elsevier BV
- Published
- 2003-07
- Volume
- 78
- Issue
- 1
- Pages
- 7-21
- ISSN
- 0002-9165 (ISSN-L)
- OpenAlex
- W2156115291
- Cited by
- 144
- References
- 188
- Citations by year
- 2026: 3 · 2024: 8 · 2023: 7 · 2022: 2 · 2021: 7 · 2020: 9 · 2019: 3 · 2018: 5 · 2017: 5 · 2016: 5 · 2015: 2 · 2014: 8 · 2013: 11 · 2012: 7
- FWCI
- 1.27
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- American Journal of Clinical Nutrition (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Rheumatology › Folate and B Vitamins Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Porphyrin Metabolism and Disorders
- Keywords
- total homocysteine, methylmalonic acid, folate deficiency, vitamin B12 deficiency, hyperhomocysteinemia, infants, children, adolescents, cardiovascular risk, renal failure, pregnancy outcomes, cobalamin status
- MeSH terms
- Adolescent, Child, Child, Preschool, Folic Acid, Folic Acid Deficiency, Food, Fortified, Homocysteine, Humans, Infant, Infant, Newborn, Methylmalonic Acid, Vitamin B 12 Deficiency
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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