Potassium, Plasma or Serum
Also known as: K
Use
This test measures the level of potassium in plasma or serum, which is essential for evaluating electrolyte balance and diagnosing conditions related to abnormal potassium levels, such as hyperkalemia and hypokalemia. Appropriate potassium levels are crucial for normal cellular functions, nerve signal transmission, and muscle contractions, including heart function.
Special Instructions
Patient should avoid exercise of arm or hand before and during collection. Ensure proper separation of serum or plasma from cells within 2 hours of collection to ensure accurate results.
Limitations
This test cannot be used with specimens collected in citrate, EDTA, potassium oxalate, or sodium fluoride as these additives can interfere with test accuracy. Hemolyzed specimens are also unacceptable, as hemolysis can cause falsely elevated potassium levels.
FDA ApprovedNew York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
LOINC Codes
- 2823-3
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Plasma
Volume
1 mL
Minimum Volume
0.2 mL
Container
Plasma separator tube
Collection Instructions
Ensure serum tube is allowed to clot completely at room temperature before separating from cells.
Patient Preparation
Patient should avoid exercise of arm or hand before and during collection.
Storage Instructions
Refrigerated transport is required for stability.
Causes for Rejection
Specimens collected in citrate, EDTA, potassium oxalate, or sodium fluoride or hemolyzed specimens. Urine is unacceptable.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 2 weeks |
| Refrigerated | 2 weeks |
| Frozen | 6 months |