Median fetal cord pH, shown with interquartile range
| Non Rotational | Rotational | Single instrument | Double instrument | |
|---|---|---|---|---|
| Arterial pH | 7.21 (7.16-7.26) | 7.19 (7.13-7.24) | 7.20 (7.15-7.25) | 7.18 (7.13-7.25) |
| Venous pH | 7.29 (7.24-7.33) | 7.28 (7.22-7.32) | 7.28 (7.23-7.33) | 7.27 (7.21-7.32) |