Final answer:
The phase of labor where the patient's cervix dilates from 8-10 cm is known as the dilation stage.
Step-by-step explanation:
The phase of labor where the patient's cervix dilates from 8-10 cm is known as the dilation stage. This is part of the first stage of labor, which is the longest stage and typically takes 6-12 hours. During this stage, the cervix becomes wider to allow for the baby's head to pass through for delivery.