Table 3.
Umbilical artery pulsatility index (PI) centile values according to gestational age
| Gestational age (weeks + days) | Centile |
||||||
|---|---|---|---|---|---|---|---|
| 3rd | 5th | 10th | 50th | 90th | 95th | 97th | |
| 24+0 | 0.83 | 0.86 | 0.91 | 1.10 | 1.31 | 1.38 | 1.42 |
| 25+0 | 0.80 | 0.84 | 0.89 | 1.08 | 1.30 | 1.37 | 1.41 |
| 26+0 | 0.78 | 0.81 | 0.87 | 1.07 | 1.29 | 1.35 | 1.40 |
| 27+0 | 0.76 | 0.79 | 0.85 | 1.05 | 1.27 | 1.34 | 1.38 |
| 28+0 | 0.74 | 0.78 | 0.83 | 1.03 | 1.25 | 1.32 | 1.36 |
| 29+0 | 0.73 | 0.76 | 0.81 | 1.01 | 1.23 | 1.30 | 1.34 |
| 30+0 | 0.71 | 0.75 | 0.80 | 1.00 | 1.21 | 1.28 | 1.32 |
| 31+0 | 0.70 | 0.73 | 0.78 | 0.98 | 1.19 | 1.26 | 1.30 |
| 32+0 | 0.68 | 0.72 | 0.77 | 0.96 | 1.17 | 1.24 | 1.28 |
| 33+0 | 0.67 | 0.70 | 0.75 | 0.94 | 1.15 | 1.21 | 1.25 |
| 34+0 | 0.66 | 0.69 | 0.74 | 0.92 | 1.13 | 1.19 | 1.23 |
| 35+0 | 0.64 | 0.67 | 0.72 | 0.90 | 1.10 | 1.16 | 1.20 |
| 36+0 | 0.63 | 0.66 | 0.70 | 0.88 | 1.08 | 1.14 | 1.18 |
| 37+0 | 0.61 | 0.64 | 0.69 | 0.86 | 1.05 | 1.11 | 1.15 |
| 38+0 | 0.59 | 0.62 | 0.67 | 0.84 | 1.03 | 1.08 | 1.12 |
| 39+0 | 0.58 | 0.60 | 0.65 | 0.82 | 1.00 | 1.06 | 1.09 |
| 40+0 | 0.56 | 0.59 | 0.63 | 0.79 | 0.97 | 1.03 | 1.06 |
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.