GA | Umbilical vein pH | Umbilical artery pH | ||||
5th percentile | Mean | 95th percentile | 5th percentile | Mean | 95th percentile | |
18 | 7.385 | 7.423 | 7.461 | 7.360 | 7.398 | 7.435 |
20 | 7.382 | 7.420 | 7.458 | 7.357 | 7.394 | 7.431 |
22 | 7.379 | 7.417 | 7.454 | 7.353 | 7.390 | 7.427 |
24 | 7.376 | 7.414 | 7.451 | 7.350 | 7.386 | 7.423 |
26 | 7.373 | 7.410 | 7.448 | 7.346 | 7.383 | 7.419 |
28 | 7.370 | 7.407 | 7.445 | 7.342 | 7.379 | 7.416 |
30 | 7.366 | 7.404 | 7.442 | 7.338 | 7.375 | 7.412 |
32 | 7.363 | 7.401 | 7.439 | 7.334 | 7.371 | 7.409 |
34 | 7.360 | 7.398 | 7.436 | 7.330 | 7.368 | 7.406 |
36 | 7.357 | 7.395 | 7.433 | 7.325 | 7.364 | 7.403 |
38 | 7.353 | 7.392 | 7.430 | 7.321 | 7.360 | 7.399 |
40 | 7.350 | 7.388 | 7.427 | 7.317 | 7.357 | 7.396 |