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HelpTest Code LAB122 Sodium, Plasma or Serum
Useful For
- Monitoring fluid and electrolyte balance and renal function
- Decreased levels are seen in prolonged vomiting and diarrhea, diminished reabsorption into the kidney and excessive fluid retention.
- Increased levels are seen in excessive fluid loss, high salt intake and increased kidney reabsorption.
Methodology
Ion-Selective Electrode (ISE)
Performing Laboratory
Bozeman Health Laboratory Services
Specimen Requirements
Specimen Type: Plasma or serum
Container/Tube: Light-green top (lithium heparin gel), red top, or gold top
Specimen Volume: 1 mL
Specimen Minimum Volume: 0.5 mL
Collection Instructions: Spin down and separate serum/plasma from cells within 2 hours.
Specimen Transport Temperature
Ambient/Refrigerated
Specimen Stability
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma or Serum | Ambient | 14 days |
| Refrigerated | 14 days | |
| Frozen | 1 year |
Reference Values
135-143 meq/L
Critical values (automatic call-back): <120 meq/L or >155 meq/L
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
84295