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Groesbeck, D. et al.

Age, gender, and race effects on cystatin C levels in US adolescents.

BACKGROUND AND OBJECTIVES: The objective of this study was to describe the normal range of serum cystatin C and identify factors associated with variability in serum cystatin C contrasting with factors that are known to influence creatinine levels in the general US adolescent population. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: Serum cystatin C and creatinine were measured in 719 participants aged 12 to 19 yr in the Third National Health and Nutrition Examination Survey, a national cross-sectional survey conducted in 1988 through 1994. We calculated gender- and race/ethnicity-specific cystatin C and creatinine ranges and conducted multivariable linear regression analyses to assess factors that contribute to variability in cystatin C and creatinine levels. RESULTS: Overall, the mean serum cystatin C level was 0.84 mg/L and was higher in male than female individuals and higher in non-Hispanic white versus non-Hispanic black and Mexican American individuals. The mean serum creatinine was 0.71 mg/dl and was higher in male than in female individuals but lower in non-Hispanic white and Mexican American compared with non-Hispanic black individuals. Unlike creatinine, which increases with age from 12 to 19 yr, cystatin C levels decrease, particularly in female individuals. After adjustment for age, gender, and race/ethnicity, uric acid and blood urea nitrogen were significantly associated with cystatin C levels. CONCLUSIONS: Serum cystatin C is significantly related to gender, age, race/ethnicity, uric acid, and blood urea nitrogen in adolescents.[1]

References

Age, gender, and race effects on cystatin C levels in US adolescents. Groesbeck, D., Köttgen, A., Parekh, R., Selvin, E., Schwartz, G.J., Coresh, J., Furth, S. Clin. J. Am. Soc. Nephrol (2008) [Pubmed]

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