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Test Code LYTS Electrolyte Panel

Specimen Type



Mint green top with gel separator

Preferred Volume

3.5 mL



Turnaround Time

3 hours

STAT Availability


Test Usage

Sodium measurements are used in the diagnosis and treatment of aldosteronism (excessive secretion of the hormone aldosterone), diabetes insipidus (chronic excretion of large amounts of dilute urine, accompanied by extreme thirst), adrenal hypertension,


Addison’s disease (caused by destruction of the adrenal glands), dehydration, inappropriate antidiuretic hormone secretion, or other diseases involving electrolyte imbalance.


Potassium measurements are used to monitor electrolyte balance in the diagnosis and treatment of disease conditions characterized by low or high blood potassium levels.


Chloride measurements are used in the diagnosis and treatment of electrolyte and metabolic disorders such as cystic fibrosis and diabetic acidosis.

Test Methodology

Ion-specific electrode and spectrophotometric, kinetic.

CPT Code


STAT Turnaround Time

1 hour

Minimum Volume

2 mL

Reference Range

See Individual Analytes.

The anion gap will be calculated as [Na] – [Cl + HCO3]. The reference range for this calculated result is 6 – 15 mEq/L.

Critical Results

Refer to individual analytes.  Sodium, potassium and carbon dioxide have critical result limits.

Test Limitations

  • Do not allow serum to remain on the cells after centrifugation. Potassium from the red cells will diffuse into the serum, giving falsely elevated results.
  • Gross lipemia causes pseudohyponatremia. 
  • Hemolysis will result in elevation of potassium results.  Release of potassium from as few as 0.5 % of the erythrocytes (from specimen collection) can increase the serum level by 0.5 mmol/L.  Grossly hemolyzed specimens are rejected.

Coverage Information

Electrolyte panel (CPT 80051) includes CO2, Chloride, Potassium, and Sodium.  Each of these may be ordered individually. A test or panel may be ordered only when all components are medically necessary to diagnose or treat an individual patient.  If all components are not medically necessary, a less inclusive panel and/or an individual test as appropriate to treat the individual patient should be ordered.

Test Includes

Electrolyte panel (CPT 80051) includes CO2, Chloride, Potassium, and Sodium in plasma  A calculated anion gap is included.

Fee Code