Table 5.
Umbilical artery systolic/diastolic ratio (S/D Ratio) centile values according to gestational age
| Gestational age (weeks + days) | Centile |
||||||
|---|---|---|---|---|---|---|---|
| 3rd | 5th | 10th | 50th | 90th | 95th | 97th | |
| 24+0 | 2.38 | 2.46 | 2.61 | 3.23 | 4.12 | 4.46 | 4.72 |
| 25+0 | 2.30 | 2.39 | 2.53 | 3.15 | 4.03 | 4.38 | 4.63 |
| 26+0 | 2.23 | 2.32 | 2.46 | 3.07 | 3.95 | 4.29 | 4.54 |
| 27+0 | 2.18 | 2.26 | 2.40 | 3.00 | 3.86 | 4.19 | 4.44 |
| 28+0 | 2.13 | 2.22 | 2.35 | 2.93 | 3.77 | 4.09 | 4.33 |
| 29+0 | 2.09 | 2.17 | 2.31 | 2.87 | 3.68 | 3.99 | 4.22 |
| 30+0 | 2.06 | 2.14 | 2.26 | 2.81 | 3.58 | 3.89 | 4.11 |
| 31+0 | 2.03 | 2.10 | 2.22 | 2.74 | 3.49 | 3.78 | 4.00 |
| 32+0 | 2.00 | 2.07 | 2.19 | 2.68 | 3.40 | 3.67 | 3.88 |
| 33+0 | 1.97 | 2.04 | 2.15 | 2.62 | 3.30 | 3.57 | 3.76 |
| 34+0 | 1.94 | 2.01 | 2.11 | 2.56 | 3.21 | 3.46 | 3.65 |
| 35+0 | 1.91 | 1.97 | 2.08 | 2.50 | 3.12 | 3.35 | 3.53 |
| 36+0 | 1.88 | 1.94 | 2.04 | 2.44 | 3.02 | 3.24 | 3.41 |
| 37+0 | 1.85 | 1.91 | 2.00 | 2.38 | 2.93 | 3.14 | 3.30 |
| 38+0 | 1.82 | 1.87 | 1.96 | 2.32 | 2.83 | 3.03 | 3.18 |
| 39+0 | 1.79 | 1.84 | 1.92 | 2.25 | 2.73 | 2.92 | 3.06 |
| 40+0 | 1.75 | 1.80 | 1.87 | 2.19 | 2.64 | 2.81 | 2.94 |
Drukker et al. International gestational age-specific centiles for umbilical artery Doppler indices: a longitudinal prospective cohort study of the INTERGROWTH-21st Project. Am J Obstet Gynecol 2020.