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Patient information

How to prepare for your ultrasound scan

Most scans need no preparation at all. A few need an empty stomach or a full bladder. Find your scan below and you will know exactly what to do, and when.

49 of 75 scans

need no preparation at all

Fasting

four hours, still water is fine

Full bladder

water in the hour before

Instructions by email

sent with your booking confirmation

Arrive five minutes early

99 Harley Street, W1G 6AQ

Find your scan

What does your scan need?

Search for your scan or choose a preparation type. Each row shows the one thing to do; follow the link for the full instructions on that scan's page.

Showing all 75 scans and treatments

Pregnancy

Early pregnancy scan

Empty bladder

An empty bladder. Your scan is performed internally (transvaginally) unless you ask otherwise, so please empty your bladder just before the scan. If you would prefer a transabdominal scan through the tummy, tell us when you book, drink a litre of water 45 to 60 minutes before and keep your bladder full. You can eat and drink as normal.

Dating scan

Empty bladder

An empty bladder. Your scan is performed internally (transvaginally) unless you ask otherwise, so please empty your bladder just before the scan. If you would prefer a transabdominal scan through the tummy, tell us when you book, drink a litre of water 45 to 60 minutes before and keep your bladder full. You can eat and drink as normal.

NIPT

Nothing to prepare

No fasting needed. Eat and drink as normal. A comfortably full bladder helps the scan part of the visit.

Gender & wellbeing scan

Nothing to prepare

No special preparation. Eat and drink as normal. A comfortably full bladder can help, but it is not essential at this stage.

Anomaly scan

Nothing to prepare

No special preparation. Eat and drink as normal. A small snack beforehand can encourage your baby to move into a helpful position.

Growth scan

Nothing to prepare

No special preparation. Eat and drink as normal. A small snack beforehand can encourage your baby to move.

Presentation scan

Nothing to prepare

No special preparation. Eat and drink as normal. You do not need a full bladder for this scan.

Cervical length scan

Nothing to prepare

Empty your bladder. A transvaginal cervical scan is clearest with an empty bladder. Please use the toilet just before your appointment.

Guided injections

Knee injections

Injection

A short questionnaire before you attend. A pre-procedure questionnaire is sent with your booking confirmation: medication, allergies, blood thinners and diabetes. Please complete it before your appointment.

Shoulder injections

Injection

A short questionnaire before you attend. A pre-procedure questionnaire is sent with your booking confirmation: medication, allergies, blood thinners and diabetes. Please complete it before your appointment.

Hip injections

Injection

A short questionnaire before you attend. A pre-procedure questionnaire is sent with your booking confirmation: medication, allergies, blood thinners and diabetes. Please complete it before your appointment.

Elbow injections

Injection

A short questionnaire before you attend. A pre-procedure questionnaire is sent with your booking confirmation: medication, allergies, blood thinners and diabetes. Please complete it before your appointment.

Wrist & hand injections

Injection

A short questionnaire before you attend. A pre-procedure questionnaire is sent with your booking confirmation: medication, allergies, blood thinners and diabetes. Please complete it before your appointment.

PRP injections

Injection

A short questionnaire before you attend. A pre-procedure questionnaire is sent with your booking confirmation: medication, allergies, blood thinners and diabetes. Please complete it before your appointment.

Calcific tendinopathy & barbotage

Injection

A short questionnaire before you attend. A pre-procedure questionnaire is sent with your booking confirmation: medication, allergies, blood thinners and diabetes. Please complete it before your appointment.

Ankle & foot injections

Injection

A short questionnaire before you attend. A pre-procedure questionnaire is sent with your booking confirmation: medication, allergies, blood thinners and diabetes. Please complete it before your appointment.

Women's health

Pelvic ultrasound

Empty bladder

An empty bladder. Your scan is performed internally (transvaginally) unless you ask otherwise, so please empty your bladder just before the scan. If you would prefer a transabdominal scan through the tummy, tell us when you book, drink a litre of water 45 to 60 minutes before and keep your bladder full. You can eat and drink as normal.

Ovarian screening

Empty bladder

An empty bladder. Your scan is performed internally (transvaginally) unless you ask otherwise, so please empty your bladder just before the scan. If you would prefer a transabdominal scan through the tummy, tell us when you book, drink a litre of water 45 to 60 minutes before and keep your bladder full. You can eat and drink as normal.

Abdomen & pelvic

FastingEmpty bladder

Fast for four hours. No food for four hours before your scan. Water is fine; avoid fizzy drinks and chewing gum.

Endometrial lining

Empty bladder

An empty bladder. Your scan is performed internally (transvaginally) unless you ask otherwise, so please empty your bladder just before the scan. If you would prefer a transabdominal scan through the tummy, tell us when you book, drink a litre of water 45 to 60 minutes before and keep your bladder full. You can eat and drink as normal.

Fibroid ultrasound

Empty bladder

An empty bladder. Your scan is performed internally (transvaginally) unless you ask otherwise, so please empty your bladder just before the scan. If you would prefer a transabdominal scan through the tummy, tell us when you book, drink a litre of water 45 to 60 minutes before and keep your bladder full. You can eat and drink as normal.

Female health check

FastingEmpty bladder

Fast for four hours. For the clearest view of the gallbladder. Water is fine; avoid fizzy drinks.

Follicle tracking

Empty bladder

An empty bladder. Please empty your bladder just before the scan. You can eat and drink as normal.

Children's Health

Baby hips

Nothing to prepare

Feed your baby beforehand. A feed shortly before the appointment helps your baby stay settled. Bring a spare nappy and a muslin.

Baby spine

Nothing to prepare

Feed your baby beforehand. A settled, recently fed baby lies still more easily. Bring a spare nappy and a muslin.

Boy testes

Nothing to prepare

No preparation needed. Your son can eat and drink as normal. Babies can be fed shortly before.

Child abdomen & pelvic

FastingFull bladder

A light stomach if possible. Avoid food for around four hours if your child can manage it; babies can be scanned just before a feed. Water is fine.

Child kidneys & urinary tract

Full bladder

A comfortably full bladder. Your child can eat as normal; a drink of water before arriving helps fill the bladder.

Child pelvic

Full bladder

A comfortably full bladder. Two or three glasses of water in the hour before, and no wee until after the scan.

Child chest / thorax

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child neck / thyroid

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child breast

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child armpit / axilla

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child soft tissue lumps

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child vascular malformation

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child hip

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child knee

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child ankle

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child elbow

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child foot

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child hand & wrist

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Child shoulder

Nothing to prepare

No preparation needed. Your child can eat and drink as normal.

Five kinds of preparation

Why some scans need a little help

Ultrasound sees through water and soft tissue but not through gas or bone. Preparation simply clears the view.

01 · 49 scans

Nothing to prepare

Eat, drink and take your medication exactly as normal, and come as you are.

Muscles, joints, the neck, thyroid, breast and skin lie close to the surface, so the probe sees them clearly whatever you have eaten.

  1. 01Wear something that leaves the area easy to reach
  2. 02Bring any earlier report or results, if you have them
  3. 03Arrive five minutes early

02 · 8 scans

Fasting

No food for four hours before your scan. Water is fine, but avoid fizzy drinks and chewing gum.

Food and swallowed air fill the bowel with gas, which blocks the view of the liver, gallbladder and pancreas. An empty stomach also keeps the gallbladder full and easy to see.

  1. 01Have your last meal four hours before
  2. 02Keep sipping still water
  3. 03Take your usual medication with a little water, unless your doctor has told you otherwise

Scans that need this

03 · 5 scans

A comfortably full bladder

Drink around a litre of water 45 to 60 minutes before your appointment, and try not to empty your bladder until after the scan.

A full bladder lifts the bowel out of the way and acts as a window onto the womb, ovaries, prostate and bladder. Your scan below shows the exact amount.

  1. 01Start drinking 45 to 60 minutes before
  2. 02Comfortably full, not bursting: if it is painful, empty a little
  3. 03You can empty it before any internal scan

Scans that need this

04 · 9 scans

An empty bladder

Empty your bladder just before the scan. You can eat and drink as normal.

Gynaecological and pelvic scans, including early pregnancy and dating scans, are performed transvaginally as standard, and the probe sits closest to the womb and ovaries when the bladder is empty. If you would prefer a scan through the tummy, ask when you book and follow the full-bladder guidance instead.

  1. 01Eat and drink as normal
  2. 02Use the bathroom just before you go in
  3. 03Note the first day of your last period

Scans that need this

05 · 8 scans

Guided injections

Eat and drink normally. Tell us when you book if you take blood thinners or are diabetic.

Steroid can raise blood sugar for a few days. Before PRP, avoid ibuprofen, naproxen and similar painkillers for a week before and after; paracetamol is fine.

  1. 01Eat and drink normally
  2. 02Wear clothing that gives easy access to the joint
  3. 03Bring a list of your medication

Scans that need this

Your day, in order

From booking to your results

  1. When you book

    Your instructions arrive

    Scan-specific preparation is sent with your booking confirmation. If anything is unclear, call us on 020 3904 4441.

  2. The day before

    Gather what you have

    Earlier scan reports, blood results, a list of your medication and, for pregnancy scans, your dates and maternity notes.

  3. Four hours before

    Last meal, if you are fasting

    Only for scans that need fasting: abdomen, liver and gallbladder, bowel and the health checks. Still water is fine all the way through.

  4. 45 to 60 minutes before

    Start drinking, if you need a full bladder

    For kidney and bladder scans, or if you have asked for a pelvic scan through the tummy. Drink around a litre and hold on until after the scan.

  5. Five minutes early

    Arrive at 99 Harley Street

    Check in at reception and settle in the lounge. Step-free access is available.

  6. During your scan

    Results explained as you go

    Your specialist talks you through what they see on screen; the written report usually follows the same day.

What to wear

Dress for the area being scanned

Comfortable clothes that let you uncover only the part we need to see.

Neck and thyroid
An open neckline; leave necklaces and scarves at home
Breast, abdomen and pelvis
A two-piece outfit, so you only undress the area being scanned
Shoulder and armpit
A vest top or loose top; skip deodorant for an armpit scan if you can
Elbow and forearm
A short-sleeved top
Hand and wrist
Remove rings and watches
Hip, knee and calf
Shorts or loose trousers
Ankle and foot
Trousers that roll up easily
Babies and children
Easy layers; bring a spare nappy, a muslin and a favourite toy
Ultrasound scanning room with machine, couch and Chesterfield sofa
Your scan roomPrivate, warm and unhurried: change only what you need to.

What to bring

Five things that help, none of them essential

Each one helps your specialist answer your question more fully. If you have none of them, just come.

Your checklist0 of 5

Tick things off as you gather them.

  1. 01

    Earlier reports and results

    Scan reports, X-rays or blood results help us compare. Useful, never essential.

  2. 02

    A list of your medication

    Especially blood thinners, steroids and fertility or hormone treatment.

  3. 03

    Your dates

    For pregnancy and gynaecology scans: the first day of your last period, or an IVF transfer date.

  4. 04

    Your insurance authorisation

    If you are claiming, bring the authorisation number from your insurer.

  5. 05

    Your question, written down

    What you most want answered. Your specialist will make sure it is.

Questions, answered

Questions about preparing

Anything else? Call 0203 904 4441, a real person answers, and a clinician can call you back.

How should I prepare for my scan?

It depends on the examination. Abdominal scans usually need a few hours of fasting; pelvic scans often need a comfortably full bladder; most musculoskeletal, thyroid and breast scans need no preparation at all. Clear, scan-specific preparation instructions are sent with your booking confirmation, and our team is a phone call away if anything is unclear.

Can I drink water before a fasting scan?

Yes. Still water is fine right up to your appointment, and it keeps you comfortable. Avoid fizzy drinks and chewing gum, which add gas to the bowel and can hide the organs we need to see.

Should I take my usual medication?

Yes, in almost every case. Take your medication as normal with a little water, unless your doctor has told you otherwise. If you take blood thinners or are diabetic and are booked for a guided injection or a fasting scan, tell us when you book so we can advise.

How full should my bladder be?

Comfortably full, not bursting. Drink around half a litre to a litre of still water in the hour before, depending on your scan, and try not to empty your bladder until afterwards. If it becomes painful, empty a little: a partly full bladder is better than an uncomfortable one.

What if I forget to prepare?

Call us or tell the team when you arrive. Many scans can still go ahead, and your specialist will tell you honestly whether the view will be good enough or whether a later appointment would serve you better.

Can I bring someone with me?

Of course. Partners are very welcome at pregnancy scans, hearing a heartbeat is a moment to share, and you may bring a companion or chaperone to any appointment. For paediatric scans a parent or guardian stays in the room throughout. A professional chaperone can also be arranged on request.

Where exactly are you, and how do I get there?

We are at 99 Harley Street, London W1, in the heart of the capital’s medical district. The clinic is a short walk from Regent’s Park, Great Portland Street and Oxford Circus stations, with Baker Street and Bond Street close by. Step-free access is available; if you have any mobility requirements, let us know when booking and we will have everything ready.

Ready when you are

Book your ultrasound scan today

Same-day and next-day appointments at 99 Harley Street. No GP referral needed, results explained before you leave.

Find your scan