Feb 8, 2018




Clinical Hub,Tools & Resources,UWHC Lab Test Directory,Chemistry


Electrolytes (LYTE) Chemistry Lab Test

Name: Electrolytes

Test Name: Electrolytes

Health Link Test Code: LYTE

LIS Test Code: LYTS

CPT Code(s): 80051

Test Component:

Sodium, potassium, chloride, total carbon dioxide and anion gap.

Included In: Basic Metabolic Panel, Comprehensive Metabolic Panel

Methodology: Ion Selective Electrode and/or Enzymatic

Days Performed: Daily, 24 hours.

In-Lab Turnaround Time: 4 hours.

Stat In-Lab Turnaround Time: 1 hour.

Specimen: Blood

Collection Container: Green cap with yellow ring (PST)

Also Acceptable: Green top, Red cap with yellow ring (SST), Red top

Collection Instructions:

Tube must be at least one quarter full.

Collection Volume: 1 mL

Pediatric Collection Volume: 0.5 mL

Stability Ambient:

1 day

Stability Refridgerated:

2 days

Stability Frozen:

2 weeks

Sample Analyzed: Plasma or serum

Testing Volume: 0.5 mL

Pediatric Testing Volume: 0.2 mL

Specimen Processing:

Centrifuge. Redraw specimen if hemolysis is present. If a complete barrier has not formed, transfer cell-free plasma/serum to plastic vial. Tube or plastic vial must be 25% full and capped. Refrigerate.

Specimen Transport:

Transport specimen to the laboratory. Transport with coolant pack if coming from clinic location.

Unacceptable Criteria:

Potassium: Hemolyzed specimens and whole blood specimens greater than 2 hours old when received by the laboratory are not acceptable.


CO2: Tubes must be 25% full and capped.


See individual tests for reference intervals, individual test stability information, or test limitations.

Critical Calls: yes

Additional Information:

Anion gap is calculated by subtracting the sum of the chloride and total carbon dioxide from the sodium result.