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Doctor insights on: Why Do Ob Docs Measure Cervical Length

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Why do ob docs measure cervical length?

Why do ob docs measure cervical length?

Helps to check: Checking the cervical length give an approximation of how likely you are to still carry the pregnancy and not get close to delivery. If the cervix length is 3cm or more, there is less likely a premature delivery. But this is only a guide. If you start having strong contractions this could change quickly. Also some women go the whole pregnancy with a cervical length of 2cm. ...Read more

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Dr. David Stamilio
38 doctors shared insights

Cervical Length Measurement (Definition)

Cervical Insufficiency An "insufficient" cervix is a weakened cervix that predisposes a woman to mid-term miscarriage or early (premature) delivery. This has also been called cervical incompetence. If your doctor suspects an insufficient cervix, he or she may suggest an ultrasound to examine the thickness of your cervical tissue. The ultrasound may be performed when you are planning a pregnancy or are in the early stages of a pregnancy. A hysterosalpingogram, or HSG, may also help determine the appearance of the cervical canal ...Read more


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I had my anatomy Scan yesterday @ 22 weeks and was told my cervix was funneling but that my cervix measured 32. Should I be worried about preterm labor? My doc said she will check cervical length again in 4 weeks. I am afraid that that is too long to wait

Its not too worrisom: Despite the funnel, a cervical length of 32 mm is still pretty long, and suggestive that your risk of preterm birth is not substantially elevated. Rechecking it in 4 weeks is reasonable but it is not a strongly dangerous finding. The most important finding is closed length, and a 32 mm length at 22 weeks is fine. ...Read more

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At 30 weeks. I have a cervix length of 2.6cm. It was about 3cm at 22 weeks. Is this normal? Its closed n firm. OB checking internally weekly till term

At 30 weeks. I have a cervix length of 2.6cm. It was about 3cm at 22 weeks. Is this normal? Its closed n firm. OB checking internally weekly till term

Yes: This is normal. You will have some thinning of the cervix as you get closer to the time of delivery. It is supposed to be closed and firm at 30 weeks, but it is normal if it gets somewhat shorter. ...Read more

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Hi, I'm 22 weeks preg now. My cervix length is 2.9 cm. My doc has askd me to take progesterone tablets. Should I be worried?pls help.I'm very tensed.

Hi, I'm 22 weeks preg now. My cervix length is 2.9 cm. My doc has askd me to take progesterone tablets. Should I be worried?pls help.I'm very tensed.

No: The cervix is a bit shortened and the progesterone is a tool to minimize the risk of further shortening. It sounds like your doctor is on top of things and will watch you closely ...Read more

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37 weeks pregnant usg acc to period date 38wk.baby head mobile cervix length 3.7 cm. Doc says this is reason to go for c sec in 38/39 week.needed?wait

37 weeks pregnant usg acc to period date 38wk.baby head mobile cervix length 3.7 cm. Doc says this is reason to go for c sec in 38/39 week.needed?wait

Reason for csec?: KhU--what is the reason for the csec? Cervical length is not usually something we do cesareans for--if this is your first baby, you may not "thin out" until the very end. Now, we do not define a term pregnancy until 39 weeks. And post-term or "late" pregnancy is not until 42 weeks. I would advise waiting for now unless there are other indicators that things are wrong with the pregnancy. ...Read more

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Doc suggests cerclage for cervix as cautionary measure since I am having twins. Is this common?

Doc suggests cerclage for cervix as cautionary measure since I am having twins.  Is this common?

NO!: There is no data to suggest that cervical cerclage helps prolong twin or other multifetal pregnancies. Do not listen to anyone telling you otherwise - in fact seek another physician to care for your high-risk pregnancy if your current doctor has this attitude. A maternal-fetal medicine specialist is your best bet. Nothing can prevent preterm birth in twins for more than 48 hours. ...Read more

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Can you tell me how to find a ob doc that would do a has anyone lost there baby with amniocentesis test 4 DNA reasons?

Can you tell me how to find a ob doc that would do a has anyone lost there baby with amniocentesis test 4 DNA reasons?

Amniocentesis Safety: Rate of loss from amniocentesis is often quoted anywhere between 1/300 to 1/500 and often it has to do with the reason why the amniocentesis is done...If there's suspicion for infection or a genetic problem...The fetus may already be predisposed to stillbirth which could be wrongfully blamed on the amniocentesis. More likely to get fluid leakage with amniocentesis (1%) than fetal loss. ...Read more

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Could i go back to my ob doc just for pap smears?

Could i go back to my ob doc just for pap smears?

Yes: Obstetricians are also gynecologists. They are very well-trained for that. ...Read more

Cervical (Definition)

Cervical relates to the first seven vertebra of the spine. It is related it the neck. Also it refers to the muscular opening/exit of ...Read more


Dr. Rebecca Thibodeau Khan
1,304 doctors shared insights

Obstetrics (Definition)

Obstetricians are doctors that focus on ...Read more