Test Name: Electrolytes
Health Link Test Code: LYTE
LIS Test Code: LYTS
CPT Code(s): 80051
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.
Collection Container: Green cap with yellow ring (PST)
Also Acceptable: Green top, Red cap with yellow ring (SST), Red top
Tube must be at least one quarter full.
Collection Volume: 1 mL
Pediatric Collection Volume: 0.5 mL
Sample Analyzed: Plasma or serum
Testing Volume: 0.5 mL
Pediatric Testing Volume: 0.2 mL
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.
Transport specimen to the laboratory. Transport with coolant pack if coming from clinic location.
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
Anion gap is calculated by subtracting the sum of the chloride and total carbon dioxide from the sodium result.