| U wave amplitude (ratio in respect to R wave amplitude) [%] | T wave amplitude (ratio in respect to R wave amplitude) [%] | Diagnostic [mEq/L] |
| 0 - 10.35 | - | Normal concentration |
| 10.36 - 12.65 | - | Hypokalemia (2.8) |
| 16.66 - 16.94 | - | Hypokalemia (2.5) |
| 16.95 - 27.06 | - | Hypokalemia (2.0) |
| 27.07 - 43.30 | - | Hypokalemia (1.7) |
| >43.30 | - | Hypokalemia (<1.7) |
| - | <18.00 | Normal concentration |
| - | 20.00 - 33.30 | Hyperkalemia (5.3) |
| - | 33.40 - 61.20 | Hyperkalemia (6.5) |
| - | 61.30 - 93.60 | Hyperkalemia (7.0) |
| - | 93.70 - 142.20 | Hyperkalemia (8.8) |
| - | 142.20 - 173.80 | Hyperkalemia (9.0) |
| - | >173.80 | Hyperkalemia (>9.0) |