Serum sodium levelsThis table lists serum sodium ranges of hyponatraemia and associated symptoms (Stern, 2015)_
| Hyponatraemia | Serum sodium range | Symptoms |
|---|---|---|
| Mild hyponatraemia | 130-135 mmol/L | Nausea, vomiting, short-term memory loss & dizziness. |
| Moderate hyponatraemia | 121-129 mmol/L | Confusion, muscle weakness, generalised malaise & headaches. |
| Severe hyponatraemia | <120 mmol/L | Lethargy, agitation, increased ICP, respiratory depression, cerebral oedema & disorientation. |