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When does the active phase of labor begin according to ACOG?

  • A. 6 cm
  • B. 3 cm
  • C. 5 cm
  • D. 10 cm
Correct Answer: A

Rationale: The active phase of labor begins at 6 cm dilation according to ACOG guidelines. At this point, the cervix is significantly dilated, signaling the transition to active labor. This stage is crucial as it signifies the acceleration of labor progress and typically involves stronger contractions leading to efficient cervical dilation. Choices B, C, and D are incorrect as they do not align with the established criteria for the active phase of labor. Choice B (3 cm) is too early for active labor, choice C (5 cm) is close but not quite at the threshold for active labor, and choice D (10 cm) is actually the full dilation stage, not the beginning of active labor. Hence, choice A (6 cm) is the correct answer.