Short Cervix During Pregnancy
The short answer
A short cervix (measuring less than 25mm before 24 weeks) increases the risk of preterm birth. It is detected through transvaginal ultrasound. Treatment options include vaginal progesterone, cervical cerclage (a stitch to hold the cervix closed), or a cervical pessary. With proper monitoring and treatment, many people with a short cervix carry to term or near-term.
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By Age
What to expect by age
Cervical length may be measured at the anatomy scan or if you have risk factors for preterm birth. A cervix shorter than 25mm before 24 weeks is concerning. Vaginal progesterone is the first-line treatment and has been shown to reduce preterm birth risk by about 45%. A cerclage may be recommended if you have a history of second-trimester loss or very short cervix.
If a short cervix was identified and treated, your provider will monitor you closely with regular cervical length checks and symptom awareness. After 24 weeks, treatment options change. Rest, activity modification, and close monitoring are common. Most cervical shortening is gradual and manageable with proper care.
What Should You Do?
When to take action
- Cervical length above 25mm on mid-pregnancy ultrasound
- Mild cervical shortening that remains stable
- You have a history of preterm birth or second-trimester pregnancy loss
- You had a cervical procedure (LEEP, cone biopsy) that may have shortened your cervix
- You are experiencing pelvic pressure or cramping
- Regular contractions, pelvic pressure, or back pain before 37 weeks
- Watery vaginal discharge that could be amniotic fluid
- Bleeding with cramping in the second trimester
Sources
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Related Maternal Concerns
Cervical Insufficiency
Cervical insufficiency (previously called incompetent cervix) occurs when the cervix begins to open too early in pregnancy, often without pain or contractions. It is a leading cause of second-trimester pregnancy loss but is treatable. With early detection through cervical length screening and interventions such as cerclage or progesterone, most women with cervical insufficiency carry their pregnancies to a viable gestational age.
Cervical Cerclage Concerns and Recovery
A cervical cerclage is a stitch placed around the cervix to help keep it closed and prevent preterm birth. It is typically placed between 12-14 weeks (prophylactic) or when cervical shortening is detected (rescue cerclage). Recovery involves some activity restrictions, but many people with cerclages successfully carry to term. The stitch is usually removed at 36-37 weeks.
Preterm Labor Signs
Preterm labor is labor that begins before 37 weeks of pregnancy and affects about 10% of pregnancies. Recognizing the signs early is critical because treatment can often delay delivery, giving the baby more time to develop. Signs include regular contractions, lower back pain, pelvic pressure, vaginal discharge changes, and fluid leaking. Contact your provider immediately if you suspect preterm labor.
Dealing with Abnormal Prenatal Screening Results
An abnormal prenatal screening result can be terrifying, but it is important to understand that screening tests are designed to cast a wide net and have significant false-positive rates. Most people with abnormal screening results go on to have healthy babies after further testing confirms the baby is fine. An abnormal screening is a reason for more information, not a diagnosis.
Pregnancy Over 35 (Advanced Maternal Age)
While pregnancy after 35 carries some increased risks (including chromosomal abnormalities, gestational diabetes, and hypertension), the vast majority of people over 35 have healthy pregnancies and healthy babies. The term "geriatric pregnancy" is outdated and does not reflect reality. With appropriate prenatal care and monitoring, outcomes are excellent.
Amniocentesis Questions and Fears
Amniocentesis is a diagnostic test performed between 15-20 weeks that analyzes amniotic fluid to detect chromosomal conditions and genetic disorders with over 99% accuracy. The risk of pregnancy loss from the procedure is approximately 1 in 500-1,000 when performed by an experienced provider. Understanding the actual risks can help you make an informed decision.