The Gynecology Ultrasound in Korea: Which Kind, and What Happens

Most guides to gynecology care mention that the doctor will “do an ultrasound” and then move on. It is worth slowing down there, because in Korea the scan is usually the substance of the appointment — and which kind you have is partly your decision.

Almost every other guide on this site mentions an ultrasound in passing — the doctor will scan you, and then you will know. That skips the part people actually want to ask about. In Korean gynecology the scan is rarely an extra step tacked onto the end; most of the time it is the appointment, and the conversation afterwards is about what the screen showed.

Two kinds, and why the difference matters

There are two scans in routine use, and they are not interchangeable.

Transvaginal (질 초음파) uses a slim probe inserted a few centimetres into the vagina. Abdominal (복부 초음파) moves a probe across the lower belly with gel, the way a pregnancy scan is usually shown on television.

The difference is distance. The uterus and ovaries sit low in the pelvis, and a transvaginal probe ends up within a couple of centimetres of them. An abdominal probe has to look through the abdominal wall and past whatever gas is in the bowel that day. In practice that means an early pregnancy, a small ovarian cyst, or the thickness of the endometrial lining are often clear on one scan and simply not visible on the other.

That is why a gynecologist here will usually suggest the internal scan first. It is not a formality.

The question the clinic asks before choosing

Before the scan, a Korean clinic will often ask whether you have had penetrative sex — sometimes asked directly, sometimes as “결혼하셨어요?” (are you married?). Asked cold, in a language you may not be comfortable in, it can land as an intrusion.

It is worth knowing what it is for. There is a long-standing convention in Korean practice of not performing transvaginal scans on patients who have not had penetrative sex, and the question is the clinic sorting you into one path or the other. It is about the probe, not about your private life, and you can answer it on exactly those terms.

You can also answer it your own way:

• If you have, and you want the clearer image, say so and the internal scan goes ahead.
• If you would rather not have an internal scan — for any reason at all, and you do not owe a reason — say so. An abdominal scan is always available.
• Some clinics offer a transrectal scan (항문 초음파) as a middle path: similar image quality to the transvaginal scan, no vaginal insertion. If that suits you better, ask whether it is available.

What it actually feels like

For most people the transvaginal scan registers as pressure rather than pain. The probe is narrower than it looks sitting on the machine, it is covered and lubricated, and it goes in a few centimetres — not far. The scan itself takes roughly five to ten minutes, and the doctor moves the probe in small arcs to bring each ovary into view, which is the part that can feel like brief pressure low down on one side.

You are not obliged to lie still through discomfort. “아파요” (apayo — it hurts) and “잠깐만요” (jamkkanmanyo — one moment) both stop things immediately.

And if it does hurt, that is worth saying out loud rather than enduring: pain in a specific spot during the scan is a finding in itself, and it can point the doctor towards conditions such as endometriosis that are otherwise hard to see. Tolerating it silently throws away information.

Bladder full or empty — the opposite answers

This is the detail that most often sends people home to come back another day.

A full bladder pushes the bowel out of the way and gives the abdominal probe a clear window; for the internal scan the same full bladder is just uncomfortable and unhelpful. If you are not sure which scan you are booked for, ask when you make the appointment.

Timing, and bleeding

Most gynecologic scans can be done at any point in the cycle, and bleeding does not stop the scan — it is often the reason for it. If you would rather not be examined during your period, that is a fair thing to say, and the appointment can move.

The exception runs the other way: for specific questions, such as following ovulation or measuring the endometrial lining, the doctor may ask you to come back on a particular day of your cycle. That is the scan being timed deliberately, not a delay.

What the scan can and cannot show

It is a good test, not a complete one. Being clear about the edges saves a lot of false reassurance.

Usually visible: fibroids and where they sit, ovarian cysts and their character, the thickness and pattern of the endometrial lining, developing follicles, an early pregnancy and — importantly — whether it is in the uterus.

Usually not: a normal fallopian tube, which simply does not appear on ultrasound. Endometriosis is often invisible unless it has formed a cyst on the ovary, which is why a normal scan does not rule it out. And the scan says nothing about your cervical cells — that is a Pap test, a separate thing done at the same visit.

So a normal scan alongside ongoing symptoms is not the end of the road. It narrows the list, and the next step is a conversation, not a shrug.

What it costs

Whether the scan is covered depends less on the scan than on the reason for it: a scan investigating a symptom or an abnormal finding sits in a different category from an elective check with no symptoms behind it. Ask “이거 급여 되나요?” (igeo geubyeo doenayo? — is this covered?) at reception before the scan rather than after, when the answer is still useful. Our guide to gynecology costs and health insurance covers how coverage works for residents on the national scheme.

You will usually leave with printed images and a short report. If the report is in Korean, our guide to reading Korean medical documents walks through what the parts mean.

Asking for what you want, in English

Everything above assumes you can say which scan you would prefer, ask what the screen is showing, and understand the answer — in the moment, half-dressed, on a table. That is a lot to do through a translation app.

At Yoonho the consultation and the scan are handled in English, so you can ask the question while the image is still on the screen. See our clinics, read our guide to seeing a gynecologist in Korea, or message us on WhatsApp or KakaoTalk.

Related guides

• Seeing a gynecologist in Korea
• Gynecology costs and health insurance
• Reading Korean prescriptions, results and receipts
• Medical Korean for a gynecology visit

This guide is general information for foreign residents in Korea, not medical advice. Coverage, costs, and treatment depend on your individual case — please confirm details with the clinic and your insurer.