An ultrasound scan can be used in several different ways, such as monitoring an unborn baby, diagnosing a condition or guiding a surgeon during certain procedures.
Pregnancy
Ultrasound scans are routine procedure for pregnant women. They produce images of the unborn baby inside the womb, and display them on a monitor.
Most women are offered at least two ultrasound scans during pregnancy:
- the first scan (at around eight to 14 weeks) can help to determine when the baby is due
- the second scan (usually between 18 and 20 weeks) checks for structural abnormalities, particularly in the baby's head or spine
However, an ultrasound scan can be done at anytime during pregnancy and causes no harm to the baby.
Read more information about when ultrasound is used during pregnancy.
Diagnosing conditions
Ultrasound scans can help diagnose problems in many parts of your body, including your:
For example, it can help to detect whether a lump in one of these organs is a tumour or a cyst.
Ultrasound may also be used to diagnose problems with your:
- blood vessels (aneurysm)
- joints, ligaments and tendons
- skin
- eyes
The hip, spine and brain of newborn babies can be scanned for abnormalities but by 18 months old the skull has fully grown and it is no longer possible to use ultrasound on the brain without surgery.
Echocardiogram (ECG)
An ultrasound scan can be used to examine the size, shape and movement of your heart. For example, it can check that the structures of your heart, such as the valves and heart chambers, are working properly and your blood is flowing normally. This type of ultrasound scan is called an echocardiogram (ECG).
ECG can also be used to diagnose heart problems in babies, even before they are born. This is called foetal echocardiography, and is carried out during routine antenatal examinations. Read more about how congenital heart disease is diagnosed.
Biopsy
Ultrasound can be used to guide doctors during certain procedures, such as a biopsy (where a tissue sample is taken for analysis). This is to make sure the surgeon is working in the right area and is often used when diagnosing breast cancer.
