Test Name

Sodium, 24-hour Urine

Test Code

291

Unit

mmol/24h

Station

Chemistry

Synonym Name/Abbreviation

Na Urine

CPT Code

84300

Performing Facility

American Medical Labs, Herzliya
Pituah

Analyzer

Roche cobas 6000

Test Method

Indirect ISE

AML Preferred Tube

24 Hour Urine Collection

Storage Instruction

Refrigerated
Stability:
Up to 14 days at room temperture.
or at 2 to 8 ^oC.
Stable at -20 ^oC.

Min. Volume

10 mL of well mixed urine from measured 24 hour
collection.

Comments

The urinary excretion of electrolytes varies significantly
with dietary intake. The values given here are typical of people on an
average diet. History of diuretics, other drug intake, setting of osmotic
diuresis or not, serum or plasma electrolytes and other factors are
needed.

Turn-Around-Time

One day

Intended Use

Work up volume depletion, acute renal failure, acute
oliguria, and differential diagnosis of hyponatremia.

Limitations

Measuring range: 10-250
mmol/L

Patient Preparation

Instruct the patient to void at 8 AM and discard the
specimen. Then collect all urine including the final specimen voided at
the end of the 24-hour collection period (i.e. 8 AM the next
morning).

Reasons for Rejection

No patient preparation
needed.

Adult Reference Ranges

 40 to 220
mmol/24 h