13 days
Ion Specific Electrode (ISE)
Cause for Rejection: Gray top tube (Sodium Fluoride / Potassium Oxalate). Polymer gel separation tube (SST or PST).
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Monitor fluoride exposure; diagnose fluoride toxicity.
Serum or Plasma
2 mL
Lavender-Top (EDTA) Tube or Red-Top Tube
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Room temperature | 30 days |
| Refrigerated | 30 days |
| Frozen | 28 months |