Table 3. Severity of hypomagnesemia.
| Severity | Levels | Signs and symptoms |
| Mild-Moderate | 0.4-0.6 mmol/L | Neuromuscular irritability, tremor, hypocalcemia, hypokalemia, widened QRS with tall T wave in moderate depletion. |
| Severe | Less than 0.4 mmol/L | Tetany, nystagmus, seizure, psychosis, atrial/ventricular tachyarrhythmias |