Final answer:
The transvaginal probe is inserted parallel to the vaginal canal, which allows healthcare professionals to visualize the location of the placenta and the cervix.
Step-by-step explanation:
The transvaginal probe is inserted parallel to the vaginal canal.
This is important when it comes to placental previa because the probe is used to visualize the location of the placenta and the cervix. By inserting the probe parallel to the vaginal canal, healthcare professionals can accurately assess the position of the placenta and determine if it is partially or completely covering the cervix.