Home
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; Chloride; Sodium:
The ion-selective electrode (ISE) module indirectly measures the electromotive force (EMF) difference between an ISE and a reference electrode. The EMF of the ISE is dependent on the ion concentration of the sample. The EMF of the reference electrode is constant. An electronic calculation circuit converts EMF of the sample to the ion concentration of the sample.(Package insert: ISE reagent. Roche Diagnostics; V14.0, 02/2018)
Bicarbonate:
This is a photometric rate reaction. Bicarbonate (HCO3[-]) reacts with phosphoenolpyruvate in the presence of phosphoenolpyruvate carboxylase to produce oxaloacetate and phosphate. The oxaloacetate produced is coupled with reduced nicotinamide adenine dinucleotide (NADH) in the presence of malate dehydrogenase to produce malate and NAD(+). The consumption of NADH causes a decrease in absorbance and is monitored in the ultraviolet range of 320 to 400 nm. The rate of change is directly proportional to the concentration of bicarbonate.(Package insert: Bicarbonate reagent. Roche Diagnostics; 04/2019)
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.