British Medical Ultrasound Society: guidance on ultrasound safety and professional standards

Ultrasound is often described as a safe, non-invasive way to look inside the body. That is broadly true when it is used appropriately—but “non-invasive” does not mean “no need to think about safety”. Ultrasound energy interacts with tissue, and the quality of an examination depends on more than a clear image on the screen.

The British Medical Ultrasound Society (BMUS) provides professional guidance to help practitioners use ultrasound responsibly. Its recommendations support good clinical judgement, safe equipment use and high standards of practice. For employers and healthcare teams, they offer a useful framework for turning safety principles into everyday habits.

What is the British Medical Ultrasound Society?

BMUS is a UK professional society for people involved in medical ultrasound. It brings together practitioners, educators, scientists and others working with the technology. The society publishes guidance, supports professional development and promotes good practice in diagnostic and therapeutic ultrasound.

It is important to understand what BMUS is—and what it is not. It is a professional body, not a substitute for legislation, local policy, clinical governance or the responsibilities of an employer. Its guidance helps practitioners make informed decisions, but each service must still consider its own patients, equipment, procedures and risks.

That distinction matters. A written guideline cannot tell you everything about a particular patient or examination. It can, however, help ensure that the right questions are asked before the probe touches the skin.

Ultrasound safety: low risk is not no risk

Diagnostic ultrasound uses high-frequency sound waves rather than ionising radiation. It does not produce X-rays. This makes it a valuable imaging tool, including in pregnancy, but it should still be used with care and for a clear clinical purpose.

Ultrasound energy can produce biological effects, including heating and mechanical effects in tissue. The likelihood of harm from routine diagnostic scanning is generally considered low when equipment is used properly by trained professionals. However, risk can depend on factors such as output settings, exposure time, the part of the body being examined and the patient’s circumstances.

In practical terms, the safety principle is simple: use ultrasound only when it is justified, and use the lowest output and shortest examination time that can provide the information needed. This is often described as the “as low as reasonably achievable” approach. It is not a reason to compromise the quality of a necessary examination; it is a reminder not to use more energy or time than the task requires.

Understanding the on-screen safety indicators

Many ultrasound systems display a Thermal Index (TI) and a Mechanical Index (MI). These indicators help the operator consider the potential for thermal and mechanical effects. They are not personal risk scores and should not be read as a guarantee that an examination is either safe or unsafe.

The numbers need to be interpreted in context. The relevant index may vary with the examination, the tissue being scanned and the patient. The operator should understand the equipment and follow current professional guidance and local procedures, rather than treating the display as decorative screen furniture.

Good practice includes checking that the correct preset is selected, using appropriate output settings and adjusting them thoughtfully. If the image is poor, increasing output is not always the best first move. Repositioning the patient, changing the angle or selecting a suitable preset may solve the problem without unnecessary exposure.

Why time and technique matter

Exposure time is one of the practical factors practitioners can control. A focused examination with a clear clinical question is usually more useful than a long scan that drifts from one view to another without a reason.

Consider a patient attending for a targeted abdominal examination. If the referral question is clear, the practitioner can plan the scan, obtain the necessary views and document the findings efficiently. If the question is vague, the examination may take longer, produce less useful information and create avoidable uncertainty. Clear referrals and good communication are therefore part of safety, not merely administrative niceties.

Operators should also be particularly thoughtful when scanning sensitive tissues or areas where exposure considerations may differ. Follow the relevant BMUS recommendations and local protocols for the examination being performed. When uncertain, seek advice from a suitably experienced colleague or the service’s ultrasound lead.

Pregnancy scans and the “keepsake” question

Ultrasound has an important role in antenatal care, where examinations are performed for clinical reasons by appropriately trained practitioners. A different situation arises when scans are offered solely to create photographs or videos, without a medical purpose.

BMUS and other professional organisations have cautioned against non-medical ultrasound examinations, particularly where they may involve prolonged or repeated exposure without clinical benefit. The concern is not that every keepsake scan will cause harm; it is that unnecessary exposure offers no health benefit to balance against even a small, uncertain risk. It may also create false reassurance or, conversely, unnecessary alarm if an unexpected image is misinterpreted.

For healthcare providers, the practical message is to keep diagnostic scanning focused on clinical need. If a patient asks for extra images or a longer scan, explain kindly why the examination has a defined purpose and why additional scanning is not automatically better. A warm conversation can be much more reassuring than a souvenir printout.

Professional competence is a safety control

Safe scanning depends on the person operating the equipment as much as on the equipment itself. Practitioners need appropriate education, supervised experience and ongoing development. They should work within their competence, recognise when a finding needs escalation and understand the limitations of the examination.

Professional registration requirements depend on a practitioner’s role and background. Employers should check the relevant professional standards and registration arrangements for their workforce, and make sure that responsibilities are clearly defined. A job title alone does not demonstrate competence; training records, assessed skills and continuing development provide a stronger picture.

In a well-run service, supervision is not a sign that someone has failed. It is a normal part of maintaining standards, especially when staff are learning new examinations, using new equipment or dealing with unusual cases. Knowing when to ask for a second opinion is a professional strength.

Equipment, quality assurance and infection prevention

Even an experienced practitioner cannot compensate for equipment that is poorly maintained or unsuitable for the task. Services should have arrangements for equipment checks, maintenance, servicing and quality assurance in line with manufacturer instructions and local policy. Faults should be reported promptly, recorded and addressed before they affect patient care.

Probe care deserves particular attention. Probes come into close contact with patients, and the cleaning or disinfection method must match the probe type and intended use. Follow the manufacturer’s instructions and local infection prevention procedures. Where a probe is used for an examination requiring a protective cover or a higher level of processing, staff need clear, practical instructions—not a faded poster behind a cupboard door.

Good housekeeping helps too. Keep cables and equipment positioned to reduce trip risks, clean spills promptly and ensure that staff can reach emergency controls. These details may seem ordinary, but workplace safety is often built from ordinary habits performed consistently.

Consent, communication and documentation

Before an examination, explain what it involves, why it is being performed and what the patient may need to do. Check that the patient understands and agrees to proceed. Consent should be meaningful, not a hurried question asked while the gel bottle is already open.

Communication is especially important if the examination may be uncomfortable, if the patient has particular access needs or if an intimate examination is required. Follow local chaperone policies and professional guidance. Give patients an opportunity to ask questions, and make sure they know how to raise a concern.

Accurate records support continuity of care and professional accountability. Documentation should reflect the clinical indication, relevant examination details, findings and any action or referral required. Follow local requirements for recording settings or safety information. A clear record can help another practitioner understand what was done and why—without having to interpret the mysteries of a hurried note.

Putting BMUS guidance into workplace practice

Guidance is most useful when it shapes routines, not when it sits untouched in a shared folder. Managers and clinical leads can make it practical by reviewing local procedures, checking training needs and involving the people who perform scans every day.

• Confirm that staff can access current BMUS guidance relevant to their examinations.

• Make sure practitioners understand TI, MI, output controls and the safe use of their specific ultrasound system.

• Review referral pathways so examinations have a clear clinical question and appropriate level of urgency.

• Keep training, competency assessment and continuing professional development records up to date.

• Check that equipment maintenance, fault reporting and probe-cleaning procedures are clear and followed.

• Encourage staff to report near misses, unclear referrals and workflow problems without fear of blame.

A short team discussion can reveal issues that a policy review misses. For example, staff may know that a particular preset produces poor images, or that a cleaning product is difficult to obtain during busy clinics. Fixing these practical barriers can improve both safety and service quality.

When practice falls short

Suppose a clinic notices that examinations are regularly running over time. The first response should not be to tell staff to “scan faster”. Instead, look at the process: Are referrals complete? Is the room set up properly? Is the equipment working as expected? Do practitioners have the right training and support?

This is the difference between blaming an individual and managing risk. BMUS guidance can inform the standard of practice, while local audit and incident review help identify where a service’s systems need improvement. If an event raises concerns about patient safety, follow the organisation’s reporting and escalation procedures.

Learning should lead to action. That might mean refreshing training, changing a referral form, updating a cleaning procedure or arranging equipment checks. A lesson that never changes anything is just paperwork wearing a serious expression.

A practical standard for safer scanning

BMUS guidance supports a balanced approach: recognise the benefits of ultrasound, understand its potential effects and use the technology responsibly. For practitioners, that means working within competence, keeping examinations clinically justified, using appropriate settings and communicating clearly. For employers, it means providing reliable equipment, effective training and procedures that work in real clinical settings.

Ultrasound safety is not achieved through one magic setting or a single policy. It comes from a series of sound decisions—before, during and after the scan. When those decisions are supported by professional guidance and a learning-focused workplace, patients receive better care and staff can do their jobs with greater confidence.