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Potassium, RBC
Test CodeKRBC
Alias/See Also
3382
CPT Codes
84132<br><strong>** This test is not available for New York patient testing **</strong>
Preferred Specimen
4 mL whole blood collected in a sodium heparin or lithium heparin (green-top) tube and
4 mL whole blood collected in an EDTA (lavender-top) tube
4 mL whole blood collected in an EDTA (lavender-top) tube
Minimum Volume
1.5 mL
Instructions
Both samples must only be collected Mon-Thurs and must be received together for testing:
4 mL (1.5 mL min) whole blood collected in a sodium heparin or lithium heparin (green-top) tube AND
4 mL (1.5 mL min) whole blood collected in an EDTA (lavender top) tube.
4 mL (1.5 mL min) whole blood collected in a sodium heparin or lithium heparin (green-top) tube AND
4 mL (1.5 mL min) whole blood collected in an EDTA (lavender top) tube.
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 48 hours
Refrigerated: 48 hours
Frozen: Unacceptable
Refrigerated: 48 hours
Frozen: Unacceptable
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Received frozen • Hemolysis
Methodology
Ion Selective Electrode (ISE)
Setup Schedule
Set up: Tues-Sat; Report available: 2-4 days
Clinical Significance
Potassium is nearly all maintained within cells. RBC Potassium may be useful in assessing potassium redistribution.
Performing Laboratory
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92690-6130
