Test Overview
Test Methodology

Potentiometric (ISE)

Test Usage

Renal function, electrolyte balance studies

Reference Range *

43 - 217 mEq/24 hrs (43-217 mMol/24 hrs). Random urine collections are reported in units of mmol/L, for which reference values are not established.

Test Details
Days Set Up
Analytic Time

8 hours

Soft Order Code
MiChart Code
Sodium, 24 HR Urine
Chemical Pathology
Specimen Requirements
Collection Instructions

Collect 24 hour urine specimen with no preservative. Aliquot 5 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.

Alternate Specimen
Specimens collected with glacial acetic acid or HCl preservative are acceptable. If collected in container with acid preservative, indicate on container and requisition: "Collected in Acid".
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.
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.
CPT Code
Fee Code
SODU 2955-3 SODQ 2956-1
NY State Approved