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Test Code UNA24H Sodium Urine, Timed LAB446

Test Method

Ion Selective Electrode Potentiometry; Beckman DXC600

Specimen Requirement

0.5 mL urine is required.

Additional Specimen Collection Information

Collect a timed urine specimen, 24 hour preferred. No
preservative is required. Label the specimen appropriately with two
identifiers, patient name and another identifier, (patient ID
number, DOB, etc.) include date and time of
collection. Indicate the time period of collection on the
container. Submit entire specimen for analysis. Store the urine
specimen refrigerated and transport to the lab within 48 hours.

Reference Values

43-217 meq/24 hours

  • Timed urine collection are reported in meq/24 Hours regardless
    of collection time.


Testing is performed Monday through Sunday.

Typically assayed within 2 hours after the specimen
arrives at the testing site.

Useful For

Assessing acid-base balance, water balance, water intoxication,
and dehydration

LOINC Code Information

2956-1 Sodium [Moles/Time] In 24 Hour Urine

CPT Code Information

82436 Chemistry: Sodium, urine