When expectant parents arrive at Mayflower Clinic for their mid-pregnancy anomaly scan (the TIFFA scan), their focus is entirely on the baby. They are eager to count ten little fingers, see the four chambers of the heart, and catch a glimpse of their baby's profile on our monitors.
However, as a Fetal Medicine Specialist, my focus extends beyond just the baby. While you are watching the screen, I am performing a silent, incredibly critical check on the mother’s anatomy—specifically, the Cervical Length Assessment.
In the realm of high-risk obstetrics, preterm birth (delivering a baby before 37 weeks) remains one of the most formidable challenges we face. A premature baby often requires a prolonged, emotionally exhausting, and financially draining stay in the Neonatal Intensive Care Unit (NICU). Fortunately, modern fetal medicine gives us a powerful tool to predict and prevent early labor: measuring the cervix. Here is everything you need to know about why this simple scan is a true lifesaver.
What is the Cervix and What is Its Job?
The cervix is the lower, narrow part of the uterus that connects the uterine cavity to the vagina. Think of it as the thick, muscular "gatekeeper" of the womb.
Throughout a normal, healthy pregnancy, the cervix must remain long, firm, and tightly closed. This physical barrier prevents the growing baby from dropping into the birth canal too early and acts as a biological shield, keeping vaginal bacteria from entering the sterile environment of the uterus. It is only at the very end of pregnancy, during labor, that the cervix should thin out (efface) and open (dilate) to allow the baby to be born.
The Silent Threat: A Short or "Incompetent" Cervix
Sometimes, the cervical muscles are inherently weak, or the pressure of the growing baby becomes too much for the cervix to bear. This condition is historically known as cervical incompetence or cervical insufficiency.
When this happens, the cervix begins to silently thin out and shorten weeks or even months before the baby is ready to be born. The most dangerous aspect of a short cervix is that it is usually completely asymptomatic. You will likely feel no contractions, no pain, and no warning signs as the gate slowly opens. Without medical intervention, this inevitably leads to a late miscarriage (in the second trimester) or extreme premature birth.
How We Measure the Cervix: The Gold Standard
Because a shortening cervix shows no physical symptoms, the only way to detect it is through a specialized ultrasound scan, routinely performed between 18 and 24 weeks of pregnancy.
Many patients are surprised when I inform them that we need to perform a Transvaginal Scan (TVS) to check the cervix. They often ask, "Can't you just see it on my belly with the regular ultrasound?"
While an abdominal ultrasound provides a decent overview, it is not clinically accurate enough to measure the cervix to the exact millimeter. The baby’s head, the mother’s bladder, and abdominal tissue can obscure the view or falsely distort the measurement.
A transvaginal ultrasound, on the other hand, places the sterile probe right at the base of the cervix. This provides a crystal-clear, highly magnified image, allowing us to measure the exact length of the closed cervical canal and check for "funneling" (where the internal part of the cervix starts to open up into a V or U shape under pressure).
Absolutely. This is a very common fear among patients in Nagpur. A transvaginal scan will not trigger labor, it will not hurt the baby, and it will not cause a miscarriage. It is a gentle, painless, and purely diagnostic procedure that takes less than five minutes but provides life-saving data.
The Numbers: What is Normal and What is Short?
During the scan, we measure the length of the closed portion of the cervix in millimeters.
- Normal Length: A healthy cervical length between 18 and 24 weeks is generally between 30mm and 45mm. This puts you in a low-risk category for preterm birth.
- The Danger Zone (Short Cervix): If the measurement drops below 25mm, it is officially classified as a short cervix. The shorter the measurement, the higher the risk of premature delivery. If it drops below 15mm, the risk becomes imminent, requiring urgent intervention.
Preventing Preterm Labor: How We Treat a Short Cervix
The beauty of the cervical length scan is that if we find a problem, we have highly effective ways to treat it. The goal of preterm labor prevention in Nagpur at Mayflower Clinic is to aggressively support the cervix, giving the baby as much time as possible to develop their lungs and brain in the womb.
Depending on your exact cervical length and your medical history (such as whether you have had a premature baby before), Dr. Kunda Shahane may recommend one of the following treatments:
1. Vaginal Progesterone Therapy
Progesterone is the "hormone of pregnancy." It naturally relaxes the uterine muscles, preventing contractions, and helps keep the cervix firm. If your cervix is short (but not dangerously open), we often prescribe progesterone in the form of daily vaginal suppositories or gel. By placing the hormone directly at the site of the cervix, it acts as a chemical reinforcement, significantly reducing the rate of preterm birth.
2. Cervical Cerclage (The "Stitch")
If your cervix is extremely short, funneling, or if you have a history of second-trimester miscarriages due to cervical weakness, we may recommend a surgical procedure called a Cervical Cerclage.
Performed under spinal or general anesthesia, this involves placing a strong synthetic suture (a stitch) completely around the cervix, essentially tying it shut like a drawstring bag. This provides powerful mechanical support to bear the weight of the pregnancy. The stitch is usually safely removed around 37 weeks in a simple outpatient procedure to allow you to go into normal labor.
3. The Arabin Pessary
For some patients where a surgical cerclage is not an option (or if they are carrying twins), we might utilize a cervical pessary. This is a small, flexible silicone ring inserted into the vagina that fits snugly around the cervix. It changes the angle of the cervix, shifting the weight of the baby off the internal opening and preventing further dilation.
4. Lifestyle and Pelvic Rest
In conjunction with medical treatments, we will advise "pelvic rest." This means no heavy lifting, avoiding strenuous exercise, and abstaining from sexual intercourse to prevent any physical trauma or prostaglandins from stimulating the fragile cervix.
Why This Matters for Central India
Managing a premature infant in a NICU takes a massive emotional and financial toll on a family. At Mayflower Clinic, our philosophy is proactive defense. We utilize the GE Voluson Signature 18 ultrasound to ensure that no structural weakness goes unnoticed.
By making the cervical length assessment a mandatory part of every mid-trimester scan we perform, we have successfully helped countless mothers in Nagpur and the Vidarbha region carry their high-risk pregnancies safely to full term.
Are you due for your 18-22 week anomaly scan? Ensure your doctor is checking your cervical length. Contact Mayflower Clinic in Dhantoli, Nagpur today to schedule a comprehensive TIFFA scan with Dr. Kunda Shahane.