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Potassium, RBC
Test Code3382
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.
