OBSbasic
The first stage of labour ends when the cervix reaches _____ cm dilatation.
Answer
10
Explanation
The first stage runs from the diagnosis of labour to full cervical dilatation, defined in the material as **10 cm**. The second stage begins at full dilatation and ends with delivery of the fetus. **Key takeaway:** The 10-cm threshold marks the transition from the first to the second stage.\n\n**Glossary:** **Full dilatation**: cervical opening of approximately 10 cm.
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