Validation of single measurement of 12-hour urine excretion for estimation of sodium and potassium intake. A longitudinal study.

Background: Evaluation of sodium and potassium intake can be carried out using different methods. Biological markers are able to capture intra and inter-individual variability and are used as separate measurements of consumption. The aim of this study was to test the validity of a single measurement of urinary sodium and potassium excretion as representative of habitual intake.