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Clin Biochem. 2007 Nov;40(16-17):1209-18. Epub 2007 Aug 11.

Plasma creatinine as a determinant of plasma total homocysteine concentrations in the Hordaland Homocysteine Study: use of statistical modeling to determine reference limits.

Author information

1
Oxford Centre for Gene Function, Department of Physiology, Anatomy and Genetics, Oxford University, UK. amany.elshorbagy@dpag.ox.ac.uk

Abstract

OBJECTIVES:

We established population-based reference limits for plasma total homocysteine (tHcy) according to creatinine.

DESIGN AND METHODS:

In 7042 middle-aged and elderly subjects from the Hordaland Homocysteine Study, we used statistical modeling to establish nomograms for tHcy according to creatinine in the whole population and in folate-replete and healthy subgroups.

RESULTS:

When plotted against creatinine, tHcy 97.5th percentile almost overlapped in men and women, and, in elderly, increased up to 8 micromol/L from the 2.5th to 97.5th creatinine percentiles. Folate-replete subjects had tHcy upper limits approximately 20% below the whole population at all creatinine levels. Healthy subjects had lower creatinine, but at a given creatinine level, tHcy was the same as in the whole population.

CONCLUSIONS:

tHcy difference between men and women is mostly explained by creatinine. The tHcy-reducing effect of folate is independent of creatinine. In elderly people, creatinine should be taken into account when assessing tHcy levels.

[Indexed for MEDLINE]

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