| Stenosis category (%) | ICPSV (v) cm/s | ICPFC (f) kHz | Ratio (r) ICA/CCA |
| < 70 | < 250 | < 8 | < 3 |
| 70‐79 | 250 ≤ v < 375 | 8 ≤ f < 12 | 3 ≤ r < 4,5 |
| 80‐89 | 375 ≤ v < 500 | 12 ≤ f < 16 | 4,5 ≤ r < 6 |
| 90‐99 | ≥ 500 | ≥ 16 | ≥ 6 |
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