Transvaginal Scan in Pregnancy: Your Complete Guide
A transvaginal scan, sometimes called an internal or TV ultrasound, is a common and safe procedure used mainly in early pregnancy to provide a clear, detailed view of your uterus and developing baby. If your midwife or clinic has recommended one, it is completely normal to feel a little uncertain about what is involved. This complete guide explains when and why transvaginal scans are used, exactly what happens during the appointment, and how they help care for you and your baby.
What Is a Transvaginal Scan?
A transvaginal scan uses a slim ultrasound probe, about the size of a tampon, gently inserted into the vagina to sit close to the uterus. Because there is less tissue between the probe and the pregnancy, the images are much sharper than those from an abdominal scan in the first trimester.
The probe is covered with a sterile sheath and lubricated with gel. Sound waves create a real-time image on a screen, just like a standard abdominal ultrasound, but with far greater detail at early gestational ages.
When Is It Used?
Transvaginal scans are most commonly offered in the first trimester, typically between 6 and 10 weeks. Your care team may recommend one to confirm the pregnancy is in the correct location, check for a fetal heartbeat, accurately date the pregnancy, or investigate bleeding or pain.
What to Expect During the Scan
The appointment usually takes around 10 to 15 minutes. You will be asked to empty your bladder first and to remove your lower clothing from the waist down. You will lie on an examination couch, usually with your knees bent or in lithotomy position.
The sonographer will explain each step and ask for your consent before inserting the probe. You may feel a small amount of pressure, similar to a smear test, but it should not be painful. If you feel discomfort, tell the sonographer immediately and they will pause or adjust. Once the probe is in place, the sonographer will move it gently to capture the images they need, then remove it. You can get dressed straight away.
Is It Safe?
Yes. Transvaginal ultrasound uses the same safe, non-ionising sound-wave technology as abdominal scans. The probe does not go near the cervix in a way that could harm the pregnancy, and there is no evidence that transvaginal scanning increases the risk of miscarriage or any complication. It is a standard, routine procedure in early pregnancy care across the UK.
Does It Affect the Baby?
No. The sound waves are at very low intensity and the probe remains in the vaginal canal, sitting close to the uterus. Your baby is safely enclosed in the amniotic sac and is not touched by the probe.
Transvaginal vs Abdominal Scans
The main difference is image clarity in early pregnancy. Abdominal scans pass sound waves through the bladder and abdominal wall, which can blur the picture before around 10 weeks. Transvaginal scans sit right next to the uterus, giving a much sharper view of tiny structures like the gestational sac and fetal pole.
Tips for Your Appointment
Wear clothing that is easy to remove from the waist down. Empty your bladder just before the scan unless told otherwise.
Summary
A transvaginal scan is a quick, safe, and valuable tool that gives your care team detailed information in early pregnancy. Understanding what happens and why it is recommended can help you feel more in control and reassured on the day.