Routine cervical checks, sometimes called pelvic exams, are a common part of late-pregnancy prenatal care in many settings, but understanding their purpose and limitations can help you make informed decisions. These checks involve your provider inserting gloved fingers into your vagina to feel your cervix, assessing its dilation (how open it is), effacement (how thin it is), and position.
What it is
During a cervical check, your care provider will manually assess the state of your cervix. They are looking for several factors: dilation, which is measured in centimeters from 0 to 10; effacement, which is the thinning of the cervix measured in percentages from 0% to 100%; and the consistency and position of the cervix. These assessments are often used to gauge how "favorable" your cervix is, particularly as you approach your due date or if there's a discussion around induction. While these checks are quick, they can sometimes cause discomfort, spotting, or mild cramping. It's important to remember that you always have the option to decline a cervical check, especially during routine prenatal visits.
What the evidence says
Evidence-Based Birth highlights that routine cervical checks at weekly prenatal visits late in pregnancy are common in the United States, but they are not evidence-based for reliably predicting when labor will start. Your dilation and effacement at a prenatal visit, even if you're a few centimeters dilated, do not reliably indicate when labor will begin. Many people walk around dilated for weeks, while others go from completely closed to active labor in a short time. The Bishop score, which is a system used to rate cervical readiness, is helpful for guiding decisions around labor induction, such as when considering Pitocin Augmentation, but it doesn't predict the natural onset of labor. While cervical checks are necessary for tracking progress once you are in active labor, they don't need to be done at predictable, frequent intervals. Your provider can often assess progress through other signs and symptoms, reducing the need for constant checks.
