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Predefined serum sodium interval.
| Sodium | Serum sodium concentration |
|---|---|
| Interval 1 (hyponatremia) | <135 mmol/L |
| Interval 2 (lower level of normal serum sodium levels) | 135–137 mmol/L |
| Interval 3 | 137–139 mmol/L |
| Interval 4 (reference interval) | 139–141 mmol/L |
| Interval 5 | 141–143 mmol/L |
| Interval 6 | 143–145 mmol/L |
| Interval 7 (hypernatremia) | >145 mmol/L |
