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Urine Sodium

Panel: Urinalysis & Urine Tests · All urinalysis tests

Typical adult reference range

Conventional units40–220 mmol/24 h
SI units40–220 mmol/24 h

Ranges vary between laboratories and methods — compare your result with the range printed on your own report.

What a high or low result can mean

High urine sodium: high values usually reflect high salt intake or diuretic use.

Low urine sodium: low values may occur with low salt intake, dehydration, or sodium-retaining states.

These are associations, not a diagnosis: the same result can have several causes, and your clinician interprets it with the rest of your results and history.

Good to know

Interpretation depends on diet, medications, and whether a spot or 24-hour sample is used.

◆ Kidney note

This test is closely tied to kidney health, and it is one a kidney specialist (nephrologist) watches closely. On this site, kidney-related results are a special focus: see the kidney and dialysis medicines in our Drug Guide and the kidney condition hubs for the wider picture.

Related tests — Urinalysis & Urine Tests

Urine Albumin-to-Creatinine RatioUrine BilirubinUrine BloodUrine CastsUrine Color and AppearanceUrine CreatinineUrine CultureUrine Glucose
Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.