What Is a Transvaginal Ultrasound and Does It Hurt?

If you have been told you need a transvaginal ultrasound, or if you have seen it mentioned and want to know what to expect, you are in the right place. It is one of the most commonly asked questions about early pregnancy scanning — and understandably so. Here is everything you need to know, including whether it hurts.

What Is a Transvaginal Ultrasound?

A transvaginal ultrasound (TVS) is an internal ultrasound scan where a small, smooth probe — roughly the size and shape of a tampon — is gently inserted into the vagina to obtain images of the uterus, ovaries, and developing pregnancy. It uses the same safe, non-invasive sound wave technology as an external abdominal scan, simply from a closer vantage point.

Why Is a Transvaginal Ultrasound Used?

In very early pregnancy — typically before 10 weeks — the uterus and embryo are still very small and low in the pelvis. An external abdominal scan may not yet be able to detect a heartbeat or provide a clear enough image. A transvaginal scan overcomes this by positioning the probe much closer to the uterus, producing a significantly clearer and more detailed image.

Common reasons a transvaginal scan may be recommended include:

• Very early pregnancy scans from 6 to 8 weeks where an abdominal scan may not yet show enough detail

• Suspected ectopic pregnancy — where a clearer image of the fallopian tubes is needed urgently

• Checking for a heartbeat when none has been detected abdominally

• Investigating bleeding or pain in early pregnancy

• BMI or body habitus making abdominal scanning more difficult

Does a Transvaginal Ultrasound Hurt?

For most women, a transvaginal scan is not painful. You may feel mild pressure or slight discomfort as the probe is positioned, but this is usually brief and well tolerated. The probe is considerably smaller than a speculum used in a cervical smear test and does not enter the cervix or uterus — it simply rests in the vaginal canal to transmit and receive sound waves.

If you have any concerns about discomfort, always let your sonographer know before the scan begins. You are in control throughout — you can ask for the scan to stop at any point.

Is a Transvaginal Ultrasound Safe in Pregnancy?

Yes. Transvaginal ultrasound is considered safe throughout pregnancy. There is no radiation involved — ultrasound uses sound waves only. It does not increase the risk of miscarriage and there is no evidence of any harmful effects on the developing baby. It is routinely used in early pregnancy units across the NHS and in private clinics worldwide.

What Should I Expect During the Scan?

Your sonographer will explain what is happening at every step. You will be asked to remove clothing from the waist down and lie on the examination couch. The probe will be covered with a protective sheath and lubricated gel before being gently inserted. The scan itself typically takes 10 to 20 minutes. Unlike an abdominal scan, you do not need a full bladder for a transvaginal scan — an empty bladder is actually preferable.

Can I Decline a Transvaginal Scan?

Yes. You always have the right to decline any procedure. If you would prefer not to have a transvaginal scan, your sonographer will do their best to obtain the information needed abdominally. However, in very early pregnancy it is worth being aware that an abdominal scan may not yet provide a clear enough image to confirm all the information you are hoping for — your sonographer will discuss this with you openly.

Early Pregnancy Scans at MyBaby Ultrasound, Camberley

At MyBaby Ultrasound in Camberley, our experienced sonographers are skilled in both abdominal and transvaginal scanning techniques. We will always explain which approach is most appropriate for your stage of pregnancy and ensure you feel fully comfortable and informed before proceeding. Early pregnancy scans start from just £65, with no referral required.