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Test Code LAB6503 Chloride, Urine, 24 Hour

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Indirect Ion-Selective Electrode (ISE)

Literature Reference:

Package insert: ISE/Na, K, Cl, Roche Corporation, 6/2014.

Specimen Requirements

Specimen Type: Urine, 24 hour

Container/Tube: Plain, brown urine container

Specimen Volume: Entire collection

Collection Instructions: No additive. Refrigerate specimen during collection.

Additional Information:

1. Starting and ending times of collection are required.

2. See Urine Collection information under General Information.
3. Containers with preservatives are NOT acceptable.

Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: 2 to 4 hours after receipt in laboratory

Test Classification and CPT Coding

81050-Volume measurement for timed collection

82436-Chloride

Reference Values

Commonly observed levels on an average diet are 40-250 mmol/24 hours with a moderate chloride intake. Levels vary with diet.

Literature Reference:

Rifai N, Horvath AR, Wittwer AT eds: Textbook of Clinical Chemistry and Molecular Diagnostics 6th ed: Chapter 60, p. 1324, Elsevier, St. Louis, MO 2018.

Specimen Transport Temperature

Ambient

Additional Information

For BJH Laboratory Use Only
Analyte Stability:
Collection must be kept refrigerated during collection and before delivery to limit bacterial growth.


Laboratory Processing Instructions:
Test performed in BJH Core Lab. Mix urine well. Record volume, period, and pH on request form. Using 13x100 test tubes, prepare a 7-mL aliquot and deliver to the automated line for centrifugation and delivery to Cobas 8000 for analysis. Completed specimen is stored refrigerated for 5 days.

Special Instructions

See Urine Collection information under General Information.

See Analyte Stability Chart under General Information for a complete list.

LOINC Code Information

Name LOINC Code
Chloride in 24 hour urine 2079-2
Collection duration 13362-9
Volume of urine 19153-6