Home
HelpOrder Code LABGOR, CLU Chloride, 24 Hour, Urine
Additional Codes
Mayo Test Code: CLU
Reporting Name
Chloride, 24 HR, UUseful For
Indication of fluid balance and acid-base homeostasis using a 24-hour urine collection
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
UrineNecessary Information
24-Hour volume (in milliliters) is required.
Specimen Required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Collection Container/Tube: 24-Hour graduated urine container with no metal cap or glued insert
Submission Container/Tube: Plastic, 5 mL tube or a clean, plastic aliquot container with no metal cap or glued insert
Specimen Volume: 4 mL
Collection Instructions:
1. Collect urine for 24 hours.
2. Refrigerate specimen within 4 hours of completion of 24-hour collection.
Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.
Specimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Urine | Refrigerated (preferred) | 14 days |
| Frozen | 30 days | |
| Ambient | 7 days |
Special Instructions
Reference Values
≥18 years: 34-286 mmol/24 hours
Reference values have not been stablished for patients who are less than 18 years of age.
Reference values apply to 24-hour collection.
CPT Code Information
82436
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| CLU | Chloride, 24 HR, U | 43128-8 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| CL24H | Chloride, 24 HR, U | 2079-2 |
| TM30 | Collection Duration | 13362-9 |
| VL28 | Urine Volume | 3167-4 |
Method Description
An ion-selective electrode (ISE) makes use of the unique properties of ion-selective membrane to develop an electrical potential (electromotive force: EMF) for the measurements of ions in solution. Selective membrane is in contact with both the test solution and an internal filling solution. Due to the selectivity of the membrane, only the ions to be measured contribute to the EMF. The membrane EMF is determined by the difference in concentration of the test ion in the test solution and the internal filling solution. The EMF develops according to Nernst equation of a specific ion in solution.(Package insert: ISE indirect Na-K-Cl for Gen 2. Roche Diagnostics; 05/2024)
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Method Name
Indirect Potentiometry
Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.
Day(s) Performed
Monday through Sunday