Casandra
Casandra Test Code QD55772Version 1 (DRAFT)
Performing Lab
Potassium, RBC
Clinical Use
Order TestUse
RBC (red blood cell) potassium measurement provides insight into intracellular potassium content, which may be useful for assessing potassium redistribution, especially when serum potassium may be misleading in certain clinical conditions.
Special Instructions
Not provided.
Limitations
Not provided.
Test Details
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
Potassium, RBC
AnalytePotassium, RBC
Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)
Result Turnaround Time
3-5 days
Related Documents
For more information, please review the documents below
Specimen Requirements
Specimen
Whole Blood
Volume
4 mL
Minimum Volume
1.5 mL
Container
sodium or lithium heparin (green‑top) tube AND EDTA (lavender‑top) tube
Collection Instructions
Both samples must only be collected Mon‑Thurs and must be received together for testing.
Storage Instructions
Room temperature
Causes for Rejection
Frozen samples; hemolyzed samples
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 72 hours (heparin), 48 hours (EDTA) |
| Refrigerated | 72 hours (heparin), 48 hours (EDTA) |
| Frozen | Unacceptable |
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