| Gestational age (weeks) | Amniotic fluid index (cm) | ||
| 5th percentile | 50th percentile | 95th percentile | |
| 24 | 9.8 | 14.7 | 21.9 |
| 25 | 9.7 | 14.7 | 22.1 |
| 26 | 9.7 | 14.7 | 22.3 |
| 27 | 9.5 | 14.6 | 22.6 |
| 28 | 9.4 | 14.6 | 22.8 |
| 29 | 9.2 | 14.5 | 23.1 |
| 30 | 9.0 | 14.5 | 23.4 |
| 31 | 8.8 | 14.5 | 23.8 |
| 32 | 8.6 | 14.4 | 24.2 |
| 33 | 8.3 | 14.3 | 24.5 |
| 34 | 8.1 | 14.2 | 24.8 |
| 35 | 7.9 | 14.0 | 24.9 |
| 36 | 7.7 | 13.8 | 24.9 |
| 37 | 7.5 | 13.5 | 24.4 |
| 38 | 7.3 | 13.2 | 23.9 |
| 39 | 7.2 | 12.7 | 22.6 |
| 40-42 | 6.9-7.1 | 11-12.3 | 17.5-21.4 |