Test Overview

Test Methodology

Potentiometric (ISE)

Test Usage

Renal function test useful in disorders of aldosterone secretion. Evaluation of electrolyte balance.

Reference Range*

26 - 123 mEq/24 hrs (26-123 mMol/24 hrs). Random urine collections are reported in units of mmol/L, for which reference values are not established.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details

Days Test Performed


Analytic Time

8 hours

Soft Order Code


MiChart Code

Potassium, 24 HR Urine


Chemical Pathology

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Specimen Requirements

Offsite Collection Instructions

Collect 24 hour urine specimen with no preservative. Aliquot 10 ml into a plastic urine container and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Random urine also acceptable.

Rejection Criteria

Specimens collected with Boric Acid preservative are not acceptable. Diapers, sections of diapers, swabs or any other absorbent material will not be accepted as a collection container for urine.

Normal Volume

5 mL aliquot of 24 hour urine collection or 2 mL aliquot of random urine collection.

Minimum Volume

2 mL aliquot of 24 hour urine collection or 1 mL aliquot of random urine collection.

Billing Information

Fee Codes

CPT Code



POTU 2828-2 POTQ 2829-0

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