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HelpTest Code ELPSR Electrolyte Panel, Serum
Necessary Information
Patient's age and sex are required.
Specimen Required
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions:
1. Serum gel tubes should be centrifuged within 2 hours of collection.
2. Red-top tubes should be centrifuged, and the serum aliquoted into a plastic vial within 2 hours of collection.
Useful For
Identifying a suspected imbalance in electrolytes or acid/base imbalance
Reporting Name
Electrolyte Panel, SSpecimen Type
SerumSpecimen Minimum Volume
0.4 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Refrigerated | 24 hours |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
Reference Values
SODIUM
<1 year: not established
≥1 year: 135-145 mmol/L
POTASSIUM
<1 year: not established
≥1 year: 3.6-5.2 mmol/L
CHLORIDE
<1 year: not established
1-17 years: 102-112 mmol/L
≥18 years: 98-107 mmol/L
BICARBONATE
Males
<1 year: not established
1-2 years: 17-25 mmol/L
3 years: 18-26 mmol/L
4-5 years: 19-27 mmol/L
6-7 years: 20-28 mmol/L
8-17 years: 21-29 mmol/L
≥18 years: 22-29 mmol/L
Females
<1 year: not established
1-3 years: 18-25 mmol/L
4-5 years: 19-26 mmol/L
6-7 years: 20-27 mmol/L
8-9 years: 21-28 mmol/L
≥10 years: 22-29 mmol/L
ANION GAP
<7 years: not established
≥7 years: 7-15
Method Description
Potassium, Sodium, Chloride:
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)
Bicarbonate:
Bicarbonate reacts with phosphoenolpyruvate (PEP) in the presence of PEPC to produce oxaloacetate and phosphate. That reaction is coupled with one involving the transfer of a hydrogen ion from reduced nicotinamide adenine dinucleotide (NADH) analog to oxaloacetate using malate dehydrogenase. The resultant consumption of NADH analog causes a decrease in absorbance, which is proportional to the concentration of bicarbonate in the sample being analyzed.(Package insert: Bicarbonate reagent. Roche Diagnostics; 02/2023)
Anion Gap:
This is a calculated result. The following equation is used to calculate the anion gap (A gap):
A gap = Na - (Cl + HCO3[-])
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 to 2 daysSpecimen Retention Time
1 weekPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
80051-Electrolyte Panel (if all 4 are performed)
82435-Chloride (if all 4 are not performed)
84295- Sodium (if all 4 are not performed)
84132-Potassium (if all 4 are not performed)
82374-Bicarbonate (if all 4 are not performed)
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| ELPSR | Electrolyte Panel, S | 24326-1 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| NAS | Sodium, S | 2951-2 |
| KS | Potassium, S | 2823-3 |
| CL | Chloride, S | 2075-0 |
| HCO3 | Bicarbonate, S | 1963-8 |
| AGAP | Anion Gap | 33037-3 |
Forms
If not ordering electronically, complete, print, and send a Kidney Transplant Test Request with the specimen.