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Spectral Doppler Ultrasound thresholds
| Stenosis (%) | PSV (cm/s) | VICA/VCCA (cm/s) | EDV (cm/s) |
|---|---|---|---|
| ≤49 | <125 | <2.0 | < 40 |
| 50–69 | 125–230 | 2.0–4.0 | 40–100 |
| ≥70 | ≥230 | ≥4.0 | > 100 |
Obtained from Ref.2
PSV, peak systolic velocity in the stenosis; VCCA, peak velocity of common carotid artery; VICA, peak velocity of internal carotid artery; EDV, end diastolic velocity in the stenosis.
