Walk past any high-street baby scan studio and you will see them in the window: golden-tinted 3D portraits of unborn babies, and looping 4D videos of yawns and stretches. They are undeniably lovely. So patients are often surprised when we tell them that IUS London does not offer 3D or 4D "bonding" scans at all — and that this is a deliberate clinical decision, not a gap in our equipment list. This article explains what 2D, 3D and 4D ultrasound actually are, what the professional bodies say about souvenir scanning, and why every scan at our clinic has to earn its place clinically.

What is a 2D ultrasound — and why is it the one that matters?

2D ultrasound is the standard, greyscale, cross-sectional imaging used throughout the NHS and in every diagnostic clinic. It is how your baby is measured, how the heartbeat is assessed, how growth is tracked, and how every screening measurement is taken. When people picture a "medical scan", they are picturing 2D — and there is a reason for that: virtually every clinically meaningful measurement in pregnancy ultrasound is made on 2D images. It is the diagnostic workhorse, and it is what our sonographers use at every pregnancy scan we perform.

What are 3D and 4D ultrasounds?

3D ultrasound assembles many 2D slices into a rendered surface image — the sculpted, skin-toned portraits you see in studio windows. 4D is simply 3D in motion: a live rendered video. To be fair to the technology, 3D imaging does have genuine clinical applications in specialist fetal medicine — assessment of certain facial or spinal findings, for example — where it is used by fetal medicine consultants to answer a specific diagnostic question that 2D has already raised. That is the key distinction: in clinical hands, 3D answers a question. In a keepsake studio, it decorates one.

What the professional bodies say about souvenir scanning

The British Medical Ultrasound Society's guidance for patients is direct: ultrasound examinations for non-diagnostic purposes, such as "keepsake" or souvenir images, are not recommended. The principle behind that position — set out in the ECMUS souvenir-scanning statement that BMUS endorses — is that a balance must always be maintained between diagnostic benefit and risk. Diagnostic ultrasound is one of the safest tools in medicine precisely because it is used prudently: the right scan, at the right time, for a clinical reason. A scan performed purely for entertainment has, by definition, no diagnostic benefit on the other side of that scale. Similar positions have been taken by international bodies including ISUOG and the WFUMB, and by the FDA in the United States.

There is a second, quieter problem the professional bodies also flag: souvenir scans can blur the line between entertainment and medicine. Patients sometimes leave a bonding studio feeling "checked" and reassured — when no diagnostic assessment has actually taken place. We wrote about where that can lead in our analysis of unregulated baby scan clinics.

Our position: every scan must earn its place

IUS London does not offer 3D or 4D bonding scans. In our view they are entertainment with no diagnostic value — and at a CQC-registered diagnostic clinic, every scan must earn its place clinically. When you book with us, you are booking a medical examination performed by an HCPC-registered sonographer, with findings explained to you and a written report your midwife or GP can act on. That is the standard we hold every appointment to, and a keepsake video cannot meet it.

This is not a judgement on parents who want those images — wanting to see your baby is the most natural thing in the world. It is a statement about what a diagnostic clinic should sell you, and what it should not.

The part nobody tells you: you see your baby at every diagnostic scan anyway

Here is what the keepsake studios rarely mention: at every diagnostic pregnancy scan, you watch your baby on screen throughout, your sonographer talks you through what you are seeing, and where possible we capture images for you to keep — as a natural part of a scan that is also doing real clinical work. An early pregnancy scan shows you the heartbeat that confirms viability. A gender scan from 16 weeks shows you your baby while checking development in evolution. A growth and wellbeing scan shows you movements and behaviour while measuring what actually matters. The bonding happens — it just happens alongside medicine instead of instead of it.

If you still want a keepsake scan elsewhere

That is your call to make, and BMUS offers sensible questions to ask first: is the person scanning you fully qualified and registered; does the clinic have a proper procedure for unexpected findings, handled sensitively by someone qualified to explain them; and is the equipment operated at settings appropriate for non-diagnostic scanning? A studio that cannot answer those three questions clearly is telling you something. And whatever you decide, never let a souvenir scan replace an NHS appointment — the 12-week combined screening scan and the 20-week anomaly scan happen through your NHS maternity pathway and should always be attended.

Frequently asked questions

Are 3D and 4D scans dangerous?

Performed by a qualified operator at appropriate settings, ultrasound has an excellent safety record — the professional concern is not that a single keepsake scan is harmful, but that scanning without diagnostic benefit abandons the prudent-use principle that underpins that safety record. The benefit side of the scale should never be empty.

Can you tell my baby's sex without 3D?

Yes — sex determination is a 2D examination. Our gender scan is available from 16 weeks and includes a check of your baby's development, not just the announcement.

Will I get pictures from my scan?

Where image quality and baby's position allow, yes — captured during your diagnostic scan, at no extra charge and at diagnostic equipment settings.

Why do other private clinics offer 3D/4D if the guidance says it is not recommended?

Because it sells. The guidance is professional guidance, not law, and the keepsake market operates largely outside clinical governance — which is exactly the concern BMUS has raised publicly. We choose to follow the guidance.

Sources: British Medical Ultrasound Society — Going for an Ultrasound Scan and Obstetric (Pregnancy) examinations, both accessed 24 July 2026.

Author: Yianni Kiromitis, Senior Sonographer, HCPC RA38415 — founder of IUS London.

Medically reviewed by: Yianni Kiromitis, Senior Sonographer, HCPC RA38415 — 24 July 2026.