alexa Average urinary excretion of sodium in 24 hours can be estimated from a spot-urine specimen.
Cardiology

Cardiology

Journal of Hypertension: Open Access

Author(s): Kawasaki T, Ueno M, Uezono K, Kawazoe N, Nakamuta S,

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Abstract We assessed to what extent sodium intake can be estimated from the sodium content of a spot-urine specimen (spot-UNa) collected within 4 hours after the first voiding upon awakening but before breakfast. Subjects were asked to collect spot-urine and 24-hour urine specimens other than the spot-urine for a 3-day period, either successively or intermittently. The coefficient of correlation between spot-UNa and urinary excretion of sodium in 24 hours (24-h UNa) collected on the first day was 0.47. When the coefficient of the variation of creatinine excretion in the spot-urine was above 20\%, the sample was discarded as the "outlier', and in this case the coefficient of correlation was 0.725. A marked fluctuation of creatinine excretion in spot-urine was considered to represent technical errors at the time of the spot-urine collection. The coefficient of variation of intra-individual 24-h UNa exceeded 20\%, suggesting that a single determination of 24-h UNa does not represent the individual average of daily urinary excretion of sodium. It is concluded that the determination of a substantial number of spot-urine specimens to estimate daily salt ingestion of a given subject may be more reliable than a single determination of 24-h UNa, if the "outlier' of creatinine excretion in spot-urine specimen is excluded from the determination of spot-UNa. The average urinary excretion of sodium in 24 hours by the Japanese subjects investigated here was 218 +/- 67 mEq.
This article was published in Jpn Circ J and referenced in Journal of Hypertension: Open Access

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