To determine if a woman is in active labor, the most definitive method involves assessing cervical changes.

To determine if a woman is in active labor, the most definitive method involves assessing cervical changes.

• a) Asking about the duration of painful contractions provides historical information but does not confirm active labor, as contractions can occur without significant cervical change.
• b) Intact membranes do not preclude active labor. A woman can be in active labor with her membranes still intact.
• d) Feeling for contractions and noting their frequency, duration, and intensity is an important part of monitoring labor, but it is an indirect sign. The definitive diagnosis of active labor relies on cervical dilation.
• c) Performing a vaginal examination to check for cervical dilation is the primary method to determine active labor. Active labor is generally defined by regular, strong contractions accompanied by progressive cervical dilation and effacement. While the exact threshold for active labor can vary (some guidelines use 6 cm, others 4 cm), a cervix dilated to at least 4 centimeters, especially with regular contractions, indicates the onset or progression into active labor.

Therefore, the most accurate way to determine active labor among the given options is by performing a vaginal examination to assess cervical dilation.

The correct option is c).

c) Perform Vaginal examination if the Cervix is dilated at least 4 Centimeters.