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Urine sodium concentration in the post-diuretic period. Spot urine sodium concentrations in the post-diuretic period are displayed as a histogram. The dotted line at 20 mmol/L indicates the traditional urine sodium concentration threshold of high sodium avid states.24–26 Only 4% of patients had a urine sodium concentration below this threshold during spontaneous natriuresis in the post-diuretic period.
