Sodium, Urine

Sodium, Urine is a topic covered in the Davis's Lab & Diagnostic Tests.

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Synonym/Acronym:
Urine Na+.

Rationale
To assist in evaluating for acute kidney injury, chronic kidney disease, acute oliguria, and to assist in the differential diagnosis of hyponatremia.

Patient Preparation
There are no food, fluid, activity, or medication restrictions unless by medical direction. Usually, a 24-hr urine collection is ordered. As appropriate, provide the required urine collection container and specimen collection instructions.

Normal Findings
Method: Ion-selective electrode.

AgeConventional UnitsSI Units (Conventional Units × 1)
6–10 yr
 Male41–115 mEq/24 hr or mmol/24 hr41–115 mmol/24 hr
 Female20–69 mEq/24 hr or mmol/24 hr20–69 mmol/24 hr
10–14 yr
 Male63–177 mEq/24 hr or mmol/24 hr63–177 mmol/24 hr
 Female48–168 mEq/24 hr or mmol/24 hr48–168 mmol/24 hr
Adult–older adult51–287 mEq/24 hr or mmol/24 hr51–287 mmol/24 hr
Values vary markedly depending on dietary intake and hydration state.

Critical Findings and Potential Interventions
N/A

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