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Average time to completion of critical OBUS tasks.
| OBUS task | Time |
|---|---|
| Identification of cardiac activity | 9 s |
| FHR measurement by M-mode | 68.6 s |
| Determination of fetal lie | 28.1 s |
| Assessment of gestational age | 158.1 s |
OBUS, obstetrical ultrasound; FHR, fetal heart rate
