{"id":"urine-sodium-24h","name":"Urine Sodium, 24-Hour","shortName":"Urine Sodium 24h","aliases":["Sodium, 24 Hour Urine","Sodium, 24h Urine","24 Hour Urine Sodium","Na, 24 Hour Urine","Sodium, 24 Hour, Urine","Sodium, 24-Hour Urine","Sodium, Urine - per 24h","Sodium, Urine, 24 Hour","Urine Sodium, 24 Hour","24-Hour Urine Sodium","24 Hr Urine Sodium","Urinary Sodium, 24 Hour","Sodium, 24 Hr Urine","Sodium, 24-Hour Urine with Creatinine"],"abbreviations":["U Na 24h","UNa 24h","24h UNa"],"loinc":[{"code":"2956-1","primary":true},{"code":"21527-7","primary":false},{"code":"21525-1","primary":false}],"specimen":"urine-24h","units":[{"ucum":"mmol/(24.h)","display":"mmol/24 h"},{"ucum":"meq/(24.h)","display":"mEq/24 h"},{"ucum":"mg/(24.h)","display":"mg/24 h"}],"referenceRanges":[{"population":"18+","low":22,"high":328,"unit":"mmol/(24.h)","unitDisplay":"mmol/24 h","note":"Mayo's adult interval (22–328 mmol/24 h), used here because it is the widest at the low end and explicitly for adults. Published intervals differ a lot: Quest prints 52–380 mmol/24 h, ARUP 51–286 mmol/d and MedlinePlus 40–220 mmol per day. The spread is real, because the result follows how much sodium you eat, so a result outside the range often reflects a very salty or very low-salt day. ARUP, Quest and MedlinePlus give no age split, and Mayo sets none under 18, so this range is applied to adults only. Your report's own range comes first.","sources":[{"title":"NAU - Sodium, 24 Hour, Urine","url":"https://www.mayocliniclabs.com/test-catalog/overview/610734/sodium-24-hour-urine","publisher":"Mayo Clinic Laboratories"},{"title":"Sodium, Urine (test 0020851)","url":"https://ltd.aruplab.com/Tests/Pub/0020851","publisher":"ARUP Laboratories"},{"title":"Sodium urine test","url":"https://medlineplus.gov/ency/article/003599.htm","publisher":"MedlinePlus Medical Encyclopedia (NIH National Library of Medicine)"},{"title":"Sodium, 24-Hour Urine without Creatinine (test code 11317)","url":"https://testdirectory.questdiagnostics.com/test/test-detail/11317/sodium-24-hour-urine-without-creatinine?cc=MASTER","publisher":"Quest Diagnostics"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The total sodium that left your body in urine over 24 hours, which mostly follows how much sodium you eat.","url":"https://bloodtesttracker.com/markers/urine-sodium-24h","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}