OBSintermediate
A patient has regular painful contractions, progressive cervical dilatation, and then reaches 10 cm. Describe the stage transitions that follow until placental delivery.
Answer
At 10 cm, the first stage ends and the second stage begins. The second stage continues until delivery of the fetus. The third stage then begins and continues until delivery of the placenta.
Explanation
Full dilatation marks the transition into the second stage, during which the fetus is delivered. Once the fetus is born, the third stage begins and concludes with delivery of the placenta. Correctly identifying transitions supports appropriate surveillance and management at each phase. **Key takeaway:** Full dilatation starts stage two; fetal birth starts stage three.\n\n**Glossary:** **Cervical dilatation**: opening of the cervix; **third stage**: interval from fetal birth to placental delivery.
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