Electrolyte Panel (LYTES)


CPT Code:   80051 
Test Includes  Carbon dioxide; chloride; potassium; sodium 
Specimen:  Serum or Heparinized Plasma 
Volume:  2 mL 
Minimum Volume:   0.8 mL 

Gel-barrier transport, green-top (heparin) tube, or lavender-top (EDTA) tube



 Ion-selective electrode (ISE); enzymatic


Serum is obtained by collecting blood in an untreated blood collection tube.  The sample should stand for 30 minutes to allow the clot to form prior to centrifugation.

Specimen tubes should be centrifuged unopened and the serum or plasma should be separated within one hour after venipuncture.

Sera or plasma separated from cells that are stored for several hours prior to analysis should be inspected for delayed fibrin clot formation.  If delayed clot formation is detected or suspected, the sample should be centrifuged before analysis.

Reference Range:  

Test Range
Sodium: 136-145 mmol/L
Potassium: 3.5-5.1   mmol/L
Chloride: 98-107   mmol/L
Carbon Dioxide:  21-32     mmol/L


Sodium, Potassium, and Chloride: 
 Temperature  Period
 Room Temperatures  1 week
 Refrigerated (2-8 ⁰C)  1 week
Carbon Dioxide:
Room Temperature 8 Hours
Refrigerated (2-8 ⁰C) 2 Days
Frozen (≤ -20 ⁰C) 6 Months


Use: See Individual Tests
Causes for Rejection: Hemolysis
Interfering Substances: See Individual Tests