Table 1.

Grades of hypomagnesemia according to common terminology criteria used by cancer societies for adverse events reported, version 4.0

GradeSerum Magnesium (mg/dl)Clinical Significance
11.2–1.7Mild or no symptoms, fatigue
20.9–1.2Muscle weakness, fasciculations
30.7–0.9Neurologic deficits, atrial fibrillation
4<0.7Psychosis, seizures, tetany, nystagmus, lethal arrhythmia