| Utility of measuring vitamin B(12) and its active fraction, holotranscobalamin, in neurological vitamin B(12) deficiency syndromes. | |
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MedLine Citation:
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PMID: 20890610 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Vitamin B(12) (VitB(12), cobalamin) deficiency has been associated with various neuropsychiatric conditions, such as peripheral neuropathy, subacute combined degeneration, affective disorders, and cognitive impairment. Current assays analyze vitamin B(12), of which only a small percentage is metabolically active. Measurement of its active fraction, holotranscobalamin, might be of greater relevance, but data in populations with neuropsychiatric populations are lacking. In this study, in order to validate VitB(12) and holotranscobalamin (holoTC) serum levels for the detection of VitB(12) deficiency in neuropsychiatric conditions, we compared the validity of VitB(12) and holoTC in a patient cohort with neuropsychiatric conditions suspicious for VitB(12) deficiency. The cohort included all patients admitted to the Department of Neurology at our university between 2005 and 2009 with at least two parameters of the VitB(12) metabolism available (n = 1,279). We used elevated methylmalonic acid as the external validation criterion for VitB(12) deficiency and restricted our analyses to subjects with normal renal function. Among all normal renal function patients, 13.2% had VitB(12) deficiency. In receiver operating characteristic curve (ROC) analysis, correlation of VitB(12) and holoTC with vitamin B(12) deficiency was generally weak, and the areas under the curve (AUC) were not significantly different for holoTC compared to vitamin B(12) in all subjects (AUC: 0.66 [95%CI: 0.51-0.82]; p = 0.04 vs. 0.72 [0.65-0.78], p < 0.0001) and in subcohorts of patients with classical VitB(12) deficiency syndromes. The positive predictive values for holoTC and vitamin B(12) were low (14.7 vs. 21.0%) and both were associated with more false-positive than true-positive test results. holoTC does not show superior diagnostic accuracy compared to VitB(12) for the detection of VitB(12) deficiency in subjects with neuropsychiatric conditions. Neither test can be recommended to diagnose VitB(12) deficiency in subjects with neuropsychiatric disorders. |
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Authors:
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Wiebke Schrempf; Marco Eulitz; Volker Neumeister; Gabriele Siegert; Rainer Koch; Heinz Reichmann; Alexander Storch |
Publication Detail:
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Type: Journal Article Date: 2010-10-02 |
Journal Detail:
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Title: Journal of neurology Volume: 258 ISSN: 1432-1459 ISO Abbreviation: J. Neurol. Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-03-02 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0423161 Medline TA: J Neurol Country: Germany |
Other Details:
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Languages: eng Pagination: 393-401 Citation Subset: IM |
Affiliation:
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Department of Neurology, Dresden University of Technology, Fetscherstrasse 74, 01307, Dresden, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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