| FHR |
Abnormal sign |
Evaluation score |
| FHR baseline |
110-130 or 160-180 bpm |
1 |
| |
<110 or >180 bpm |
3 |
| Deceleration |
|
|
| Duration |
>60 sec |
3 |
| Amlitude |
>50 bpm |
2 |
| Nadir heart rate |
<100 bpm |
2 |
| Recovery time |
>40 sec |
3 |
| Lag time |
>40 sec |
3 |
| No associated acceleration |
|
2 |
| Loss of variability, |
W-shaped dip |
4 |
|
