Cervical length refers to the measurement of the length of the cervix, which is the narrow passage at the lower end of the uterus that connects to the vagina. This measurement is often taken during pregnancy to assess the risk of preterm birth. A shorter cervical length has been associated with an increased risk of preterm labor and delivery. Research in this area focuses on understanding the relationship between cervical length and preterm birth, as well as developing methods to accurately measure cervical length and identify interventions to reduce the risk of preterm birth. Various techniques, such as transvaginal ultrasound, have been used to measure cervical length and assess the potential for preterm birth.