文章基本信息

标题：Comparison of C-reactive Protein Levels between Serum and Plasma Samples on Long-term Frozen Storage after a 13.8 Year Interval: The JMS Cohort Study
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作者：Shizukiyo Ishikawa ; Kazunori Kayaba ; Tadao Gotoh 等
期刊名称：Journal of Epidemiology
印刷版ISSN：0917-5040
电子版ISSN：1349-9092
出版年度：2007
卷号：17
期号：4
页码：120-124
DOI：10.2188/jea.17.120
出版社：Japan Epidemiological Association
摘要：BACKGROUND: C-reactive protein (CRP) is an acute phase reactant, and has been reported as a predictor of cardiovascular diseases. Measurements of high sensitive CRP in thawed samples are possible and the values are thought to remain stable even after frozen storage. However, the long-term stability of CRP values has not been documented. We measured the values of CRP before and after long-term storage, and examined the difference in determined values. METHODS: High sensitive CRP was measured before and after long-term storage of samples from 99 men and women among the JMS Cohort Study subjects. We selected subjects who underwent measurement of high sensitive CRP at the baseline by stratified sampling methods using baseline CRP values. CRP was measured in serum samples at the baseline and in thawed plasma samples after an average storage period of 13.8 years. RESULTS: Geometric means of CRP were 0.25 mg/L and 0.59 mg/L before and after storage, respectively. The CRP values were significantly higher after long-term frozen storage than at the baseline (p<0.0001). The both values of logarithm CRP were significantly correlated using Pearson's correlation (r = 0.920, 95% confidence interval: 0.883-0.945). CONCLUSION: CRP values increased after long-term frozen storage. The CRP values showed a high correlation between before and after long-term storage. J Epidemiol 2007; 17: 120-124.
关键词：C-reactive Protein;Stability;Time;Plasma;Japanese