Anomaly / Anatomy Scan - Morphology Ultrasound Scan - 20-24 weeks of pregnancy

What is an anomaly scan?

The Anomaly scan is one of the most important ultrasounds you will have during your pregnancy. It is usually performed at around 20 weeks, when all your baby’s major organs will be visible. We will perform a thorough check for conditions, measure your baby’s growth, and make sure the placenta is healthy. If you haven’t already had a sexing scan, then we’ll also be able to tell you if your baby is a boy or girl.

Why this scan?

  • Assess baby’s growth to ensure that baby is growing well
  • Checks the physical development of your baby
  • Check the placenta, amniotic fluid and the umbilical cord. 

What you will receive

  • Detailed ultrasound report for your maternity notes
  • Scan pictures
  • Link to your electronic pictures and video

When Should You Have the Anomaly Scan?

The anomaly scan is recommended for all women at 20-24 weeks of pregnancy. At this stage in your baby’s development it is possible to see detailed pictures of the head, brain, limbs, spine and major organs. We can therefore check that everything is developing as expected and detect any abnormalities. We will also measure your baby so that we can see how much he or she has grown since the last scan and check the cervix, placenta, amniotic fluid and umbilical cord.

The Anomaly scan is usually the most detailed health check that we will perform during your pregnancy. Although it can’t detect all kinds of abnormalities, it can provide a lot of information about your baby. It can also be very reassuring to hear that everything is looking good on the scan.

If you haven’t had a scan since the nuchal ultrasound, then you will be able to find out your baby’s gender during the anomaly scan. You will also be able to see how much your baby has grown and changed since your last ultrasound. By 20 weeks your baby is fully formed but only measures about 25cm from head to heel. Babies are already very active at this stage, so you may see him or her moving around during the scan.

What to Expect

  • The anomaly scan is usually performed between 20-24 weeks
  • It is a trans-abdominal scan, so the ultrasound probe will be placed against your belly. You’ll need to pull back your clothing so that we can place the probe against your skin. It is also helpful to have a moderately full bladder, so you should have a drink of water before the scan.
  • In most cases, the results will reassure you that everything is well. If any issues are detected, then you may need further tests or treatment to address them. You will be able to discuss the results with one of our experienced sonographers if you have any concerns.

Arranging Your Anomaly Scan

We can perform your anomaly scan at our ultrasound clinic in Cheshire. You should book your anomaly scan for between 20 and 24 weeks of pregnancy. It’s easy to make an appointment at a time that suits you using our simple online booking system.

Patient Information

Some early pregnancy ultrasound scans are performed using a transvaginal probe technique. This technique is used to view the pelvic anatomy optimally, as the ultrasound probe can transmit safe ultrasound waves more directly to the pelvic area. In later stages of pregnancy, it may be advised to perform a transvaginal ultrasound scan to have a closer look at a baby’s anatomy, or to assess the maternal cervix.

There is no clinical risk associated with performing a transvaginal ultrasound scan. Transvaginal ultrasound scans can safely be performed during episodes of vaginal bleeding. 

It is important that you understand the procedure that is associated with this examination.

The ultrasound transducer will be placed in the vagina (the probe is prepared using high grade medical disinfectant)
The transducer will be introduced with a latex / non latex type covering and sterile ultrasound gel.
It will be necessary to move the transducer from side to side, up and down and may be swivelled to obtain ultrasound images of your pelvic anatomy.
If you prefer, you may insert the transducer yourself, otherwise the person conducting the examination will do this.
A third person may be present during the examination acting as a chaperone, if required by the sonographer or yourself.
You may request the examination to be stopped at any time during the procedure.   


If you are a virgin (Virgo intacta; hymen intact), guidance determines that transvaginal ultrasound scans are clinically contraindicated. If you have discussed this concern with your referrer and wish to proceed with a transvaginal ultrasound scan, this type of examination can be performed.

Should I get the COVID-19 Vaccine in pregnancy?

COVID-19 vaccines are strongly recommended in pregnancy. Vaccination is the best way to protect against the known risks of COVID-19 in pregnancy for both women and babies. Women may wish to discuss the benefits and risks of having the vaccine with their healthcare professional and reach a joint decision based on individual circumstances.

Frequent questions regarding the COVID-19 Vaccine

Find below a link to a Q&A from the Royal College of Obstetricians and Gynaecologists regarding Covid-19 Vaccines, pregnancy, and breastfeeding.

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Clinic Locations

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137 Harley Street, London W1G 6BF
Nearest Underground Tube Stations

Baker Street
Regent’s Park
Great Portland Street


Talbot Road, Talbot Road, Alderley Edge, Cheshire SK9 7HR
Nearest Overground Train Station

Alderley Edge