On the traditional modified World Health Organization (WHO) partograph, plotting begins on the alert line when cervical dilatation reaches _____ cm.
Answer
4
Explanation
The slides state that the active phase commences at **4 cm** and that the first cervical dilatation plot is placed on the alert line. This threshold is reported as part of the supplied teaching material. **Key takeaway:** The course material begins active-phase plotting at 4 cm.\n\n**Glossary:** **Active phase**: the portion of the first stage monitored for progressive cervical dilatation.