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Laboratory Medicine

Laboratory Test Catalogue

Electrolytes, Serum (Lytes, NA, K, CL, CO2)

Test Name

Electrolytes, Serum (Lytes NA, K, CL, CO2)

Gold Tube Specimen Type / Requirements

Container Type = Gold (SST)

Minimum Volume = 1ml Serum

Tube must fill to at least ½ or greater of its vacuum capacity

Specimen Handling

Collection Instructions: Serum or plasma, free from hemolysis, collected with or without gel separator. For plasma use lithium or ammonium heparin only. Separate serum or plasma from cells within 2 hours of collection

Write your initials, date and time of collection on the collection label.

Stability: Lytes is stable at room temperature for 24 h, refrigerated for 1 week and frozen at -15 to -20°C for 6 months.

Transportation: Transport at room temperature ASAP.

Laboratory Staff Instructions: Separate serum or plasma from cells within 2 hours of collection. .

Sample Rejection Criteria: Avoid Hemolysis and/or Non sufficient Quantity (Not Sufficient Quantity)

Required Documentation

Turnaround Time (TAT)

45 minutes Trauma/Stat, 2 hour routine

Test Utilization

Reference Value

Sodium: 135 - 145 mmol/L

Potassium: Serum: 3.5-5.0 mmol/L

Potassium Plasma: 3.2-4.8 mmol/L

Chloride: < 10 years: 96-110 mmol/L

Chloride: >10 years: 96-106 mmol/L

Test Code



Indirect ISE

Testing Location


Other Information

Last Updated: June 06, 2019