In a transvaginal scan in ~ 20 weeks, Richa Bishnoi was notified that she would have to undergo a cesarean section due to the fact that her cervical length was 20 mm. Having had actually a legacy before and also determined to prevent surgery, she chose to get a 2nd opinion. 

During the food of her research on hospitals and gynecologists that motivated normal delivery, she came across the profile of Dr. Swati Sinha, Consultant Obstetrician-Gynecologist with over two decades of experience. She scheduled an meeting without any type of delay.

You are watching: Normal cervical length at 20 weeks

Richa anxiously told the physician her situation and also asked for guidance. 

The physician listened to she concerns and also then described “The cervix which is the mouth the the uterus is generally closed and firm in ladies who space not pregnant. Throughout pregnancy, that becomes much less firm and decreases in size with time. “ 

Richa want to understand why the size of the cervix was measured.

Reason because that Assessing Cervical Length

Studies display that the size of the cervix is an indicator of preterm births. The lower part of the uterus is not completely formed prior to 16 weeks and also so the cervical length is measured in between 16 to 24 weeks of gestation.

How is cervical size measured?

The many accurate means to measure the cervical length is with a transvaginal ultrasound. The cervical length may it is in measured v a transabdominal ultrasound but a complete bladder may interfere with these measurements and cause the length to appear longer. 

Is the Cervical Length Measured for Every Pregnant Woman?

No. Her gynecologist may advise a transvaginal ultrasound to gauge the size of the cervix if you space carrying one baby and have a history of preterm bear or miscarriage.

According to The culture for Maternal – Fetal Medicine, regime transvaginal cervical size screening need to not be performed for women with cervical cerclage, multiple gestation, preterm premature birth rupture of membrane or placenta previa.

Richa was curious come know an ext about the cervical length and also its implications. 

What is the common cervical length?

At 20 weeks the typical cervical length is approximately 30-40 mm. 

Women regularly search for a cervical size chart in mm  that includes the common cervical length at 7 weeks, normal cervical length at 30 mainly etc however actually the just measurement to walk by is the regular cervical length.

What is a short cervical length?

A cervix the is much less than 25 mm is thought about a quick cervix. 

The shorter the cervix beforehand in pregnancy, the greater the possibilities of a preterm birth.

Richa realized the the length of her cervix was less than the typical length and put her at hazard of having actually a premature birth baby.

She asked about the causes of a short cervix.

What causes a short cervix?

Cervical insufficiency or cervical incompetence may reason the cervix to shorten and open by the second trimester. This happens since the cervical muscles may have weakened due to surgery in the cervix, a previous daunting birth or structural abnormalities in the uterus. 

“So how does a short cervix reason a preterm birth?” she asked.

“The cervical length usually shortens in between 28 to 30 weeks, “ began Dr Swati, “during labour, once you are ready to offer birth and your infant has totally developed, the cervix starts to dilate or open (termed cervical effacement) so the the baby can slide right into the birth canal because that delivery.”

“But if the cervix is shortened much before time, a preterm birth or miscarriage may occur.”

Richa’s forehead creased with worry.

The doctor was quick to an alert and comforted her, “Don’t worry. We deserve to treat a short cervix to aid prevent a preterm delivery.”

How to Treat a Short Cervix

A few options to manage a brief cervix are:

Cervical Cerclage

This is a procedure in which the cervix is stitched increase to stop it from shortening and also opening further. 

A cervical stitch might not be an ideal for ladies who space experiencing contractions (because this will prevent the stitch from continuing to be in place), quality bleeding or infection. Cervical cerclage may not protect against preterm labour in women v multiple babies.

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Hormonal treatment v Progesterone Injections

For women with a quick cervix and a background of preterm births, progesterone injections or gel application might be recommend if you are carrying a single baby. The hormone progesterone help the uterus grow and can prevent contractions. This allows the pregnancy to development to full-term (39-40 weeks and six days).

Cervical Pessaries

A pessary or silicone ring can be placed through the vagina to assistance the to reduce cervix in women v a solitary baby. When cervical pessaries room used around the world, an ext research is essential to prove that pessaries assist prevent preterm births. 

After having interpreted all the options, Richa determined to go ahead v the cervical cerclage. 

She made decision to continue her consultations with Dr Swati, considering how calmly and clearly the doctor notified her the the condition. 

In she 37th week, the doctor removed the cervical stitch. 

Richa then asked “ What is the appropriate cervical length at 37 mainly for common delivery?”

Is over there an ideal cervix length for typical delivery?

The cervical length should no restrict girlfriend from having actually a normal delivery.

“In women with a short cervix, our main goal is to protect the baby and also the mother by reducing the threat of a preterm shipment as the baby is not completely developed.”

“If a woman goes into labour prematurely, she can still have a quality birth. A cesarean is forced only if there room complications or the infant is unable to move down the bear canal.”

Richa was relieved to hear that she would certainly be may be to try for a vaginal delivery. 

Richa Bishnoi’s birth Story

A few weeks later Richa experienced work pains and also rushed to the hospital. V her husband continuous by she side, she had the ability to endure labour and also eventually offered birth come a beautiful baby girl.

“I was screaming and shouting yet the nurses, doctor and also my husband comforted and motivated me. They provided me the confidence come go with the vaginal bear I constantly wanted,” claimed Richa, caressing the infant in she arms.

This article has been written through editorial inputs from Dr. Swati Sinha, that has years of suffer as an Obstetrician-Gynecologist and has taken on high-risk and low-risk pregnancies successfully. She is loved and appreciated through couples not just for her expertise but also for she optimistic and supportive nature.

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Dr. Swati Sinha, MBBS, Maulana Azad clinical College, new Delhi (1996); MD (Obstetrics & Gynaecology), Lady Hardinge clinical College, new Delhi (2001); MRCOG component 1 (October 2010)

Come in for a complimentary consultation v Dr. Swati Sinha in ~ our hospital in southern Delhi! Please contact on +919871001458 to schedule a complimentary consultation.