Internal (Transvaginal) Scan: Complete Guide
An internal, or transvaginal, scan is a common part of early pregnancy care. It sounds more daunting than it is, and understanding what to expect beforehand usually takes most of the anxiety out of it.
What an Internal Scan Involves
A transvaginal scan uses a thin, wand-shaped probe — roughly the width of a tampon — that's inserted a short distance into the vagina rather than passed over the abdomen. Because the probe sits so much closer to the uterus, it gives a clearer, more detailed picture than an abdominal scan can in very early pregnancy, when the uterus is still small and low in the pelvis.
- The probe is covered with a protective sheath and lubricating gel before use
- You'll be asked to undress from the waist down and lie on an examination couch, usually with your knees bent
- The sonographer inserts the probe gently, a few centimetres, and moves it slightly to get different views
- The scan itself typically takes 10 to 15 minutes
- You're free to ask the sonographer to stop or pause at any point if you feel uncomfortable
Why It's Used
- To confirm a pregnancy and check its location very early on, before an abdominal scan would show anything useful
- To measure the baby accurately and estimate a due date in the first weeks
- To check for a heartbeat when it's too early to see clearly via the abdomen
- To assess the cervix later in pregnancy, for example if there are concerns about early labour or cervical length
- To investigate bleeding or pain in early pregnancy
Is It Safe, and Does It Hurt?
Internal scans are considered safe for both you and your baby — ultrasound doesn't use radiation, and the probe doesn't come into contact with the baby or the pregnancy itself. Most people describe the sensation as mild pressure or slight discomfort rather than pain, similar to an internal examination. If you have a full or empty bladder concern, unlike some abdominal scans, a transvaginal scan doesn't usually require a full bladder — your sonographer will tell you if any preparation is needed for your specific appointment.
Frequently Asked Questions
Is a transvaginal scan painful?
No, it shouldn't be painful. Most people find it slightly uncomfortable, similar to a smear test, but not painful. The probe is thin, well-lubricated, and inserted gently. You can ask the sonographer to stop at any time if you feel any discomfort.
Why would I need a transvaginal scan instead of an abdominal one?
In very early pregnancy, the uterus is too small and low for an abdominal scan to give a clear picture. A transvaginal scan sits much closer to the uterus, so it can confirm the pregnancy, check the heartbeat, and date the pregnancy more accurately at this stage.
Can I say no to an internal scan?
Yes. It's always your choice, and you can decline or ask for an abdominal scan instead if one is appropriate for your stage of pregnancy. Talk to your sonographer or midwife about your options if you're unsure or feel anxious about the procedure.
This article is for informational purposes only and does not constitute medical advice.
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