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HelpTest Code CHLORIDE-UR-R Chloride, Random, Urine
Additional Codes
| Mayo Test ID |
|---|
| RCHLU |
Reporting Name
Chloride, Random, UUseful For
An indicator of fluid balance and acid-base homeostasis
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
UrineSpecimen Required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Container/Tube: Plastic, 5-mL tube
Specimen Volume: 5 mL
Collection Instructions:
1. Collect a random urine specimen.
2. No preservative.
Specimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 14 days | |
| Frozen | 30 days | ||
| Ambient | 7 days |
Reference Values
No established reference values
Random urine chloride may be interpreted in conjunction with serum chloride, using both values to calculate fractional excretion of chloride.
The calculation for fractional excretion (FE) of chloride (Cl) is
FE(Cl) =(Cl [urine] x Creat [serum])/(Cl [serum] x Creat [urine]) x100
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
82436
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| RCHLU | Chloride, Random, U | 2078-4 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| RCHLU | Chloride, Random, U | 2078-4 |
Clinical Information
Chloride is the major extracellular anion. Its precise function in the body is not well understood; however, it is involved in maintaining osmotic pressure, proper body hydration, and electric neutrality. In the absence of acid-base disturbances, chloride concentrations in plasma will generally follow those of sodium.
Since urine is the primary mode of elimination of ingested chloride, urinary chloride excretion during steady state conditions will reflect ingested chloride, which predominantly is in the form of sodium chloride. However, under certain clinical conditions, the renal excretion of chloride may not reflect intake. For instance, during states of extracellular volume depletion, urine chloride (and sodium) excretion is reduced.
Interpretation
Urine sodium and chloride excretion are similar and, under steady state conditions, both the urinary sodium and chloride excretion reflect the intake of sodium chloride. During states of extracellular volume depletion, low values indicate appropriate renal reabsorption of these ions, whereas elevated values indicate inappropriate excretion (renal wasting). Urinary sodium and chloride excretion may be dissociated during metabolic alkalosis with volume depletion where urine sodium excretion may be high (due to renal excretion of sodium bicarbonate) while urine chloride excretion remains appropriately low.
Cautions
High urine values of other halide ions (eg, bromide, fluoride, iodide) may lead to falsely high readings on the chloride ion-selective electrode (ISE).
Reject Due To
| All specimens will be evaluated at Mayo Clinic Laboratories for test suitability. |
Method Name
Potentiometric, Indirect Ion-Selective Electrode (ISE)
Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.
Day(s) Performed
Monday through Sunday