Sodium and potassium content of 24 h urinary collections: A comparison between field-and laboratory-based analysers

Xuejun Yin, Bruce Neal, Maoyi Tian, Zhifang Li, Kristina Petersen, Yuichiro Komatsu, Xiangxian Feng, Yangfeng Wu

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Objective Measurement of mean population Na and K intakes typically uses laboratory-based assays, which can add significant logistical burden and costs. A valid field-based measurement method would be a significant advance. In the current study, we used 24 h urine samples to compare estimates of Na, K and Na:K ratio based upon assays done using the field-based Horiba twin meter v. laboratory-based methods. Design The performance of the Horiba twin meter was determined by comparing field-based estimates of mean Na and K against those obtained using laboratory-based methods. The reported 95 % limits of agreement of Bland-Altman plots were calculated based on a regression approach for non-uniform differences. Setting The 24 h urine samples were collected as part of an ongoing study being done in rural China. Subjects One hundred and sixty-six complete 24 h urine samples were qualified for estimating 24 h urinary Na and K excretion. Results Mean Na and K excretion were estimated as 170·4 and 37·4 mmol/d, respectively, using the meter-based assays; and 193·4 and 43·8 mmol/d, respectively, using the laboratory-based assays. There was excellent relative reliability (intraclass correlation coefficient) for both Na (0·986) and K (0·986). Bland-Altman plots showed moderate-To-good agreement between the two methods. Conclusions Na and K intake estimations were moderately underestimated using assays based upon the Horiba twin meter. Compared with standard laboratory-based methods, the portable device was more practical and convenient.

Original languageEnglish (US)
Pages (from-to)1036-1042
Number of pages7
JournalPublic Health Nutrition
Volume21
Issue number6
DOIs
StatePublished - Apr 1 2018

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health

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