• Category I: Normal baseline and variability and no late or variable decelerations
• Category II: All tracings not classified as category I or III
  Predictive of neither normal or abnormal acid–base status
  Continued observation and assessment are required
  Represents a clinical dilemma (high false-positive rate may lead to unnecessary cesarean delivery
• Category III: Absent variability with late decelerations, recurrent variable decelerations, or FHR <100 beats/min
  Correct with maternal oxygen administration; correction of maternal hypotension or aortocaval compression or measures to decrease uterine activity
  If FHR does not response to corrective measures, imminent delivery may be required

FHR = fetal heart rate.