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Chiou scoring system for ultrasound diagnosis of varicocele
| Parameter | Criteria | Score |
|---|---|---|
| Maximum vein diameter (mm) | < 2.5 | 0 |
| 2.5–2.9 | 1 | |
| 3.0–3.9 | 2 | |
| ≥ 4.0 | 3 | |
| Plexus/sum of diameter of veins | No plexus identified | 0 |
| Plexus identified with sum diameter < 3 mm | 1 | |
| Plexus identified with sum diameter 3–5.9 mm | 2 | |
| Plexus identified with sum diameter ≥ 6 mm | 3 | |
| Change of flow velocity on Valsalva maneuver | < 2 cm/s or duration < 1 s | 0 |
| 2–4.9 cm/s | 1 | |
| 5–9.9 cm/s | 2 | |
| ≥ 10 cm/s | 3 |
