Internal OS Closed: What Does It Mean in Pregnancy Scan Report A woman’s body undergoes a lot of changes during the pregnancy period. Not just externally but internally as well. If you are a first-time mother who is entirely clueless about medical terminologies, coming across the term “Internal OS Closed” can sound daunting. However, be assured that there’s nothing wrong with you or the baby. The Internal OS is part of the cervix and should remain closed during the pregnancy. This prevents premature delivery and supports a healthy full-term pregnancy ride for the mother and the child. https://pregajunction.com/blog/internal-os-closed-in-pregnancy-scan-report/