Pregnancy scans: which scans you need and when
The routine ultrasound scans in pregnancy, from the dating scan to the anomaly and growth scans: what each one checks and roughly which week it is done.
By the Healtree Hospital clinical team.
Most pregnancies have three to four routine ultrasound scans: an early dating scan (around 6 to 10 weeks), the NT scan with blood tests (11 to 14 weeks), the anomaly scan (18 to 22 weeks) and often a growth scan in the third trimester. Your obstetrician may add scans if there is a medical reason. Ultrasound uses sound waves, not radiation.
Talk to a specialist
Obstetrics & Gynaecology
MBBS, DNB (Obstetrics & Gynaecology)
Book with Dr. R. SuganyaAbout Obstetrics & GynaecologyEarly dating scan (6 to 10 weeks)
This first scan confirms that the pregnancy is in the womb, checks the heartbeat, shows whether there is more than one baby, and dates the pregnancy so the due date is accurate. In very early pregnancy it may be done through the vagina for a clearer picture.
NT scan (11 to 14 weeks)
The nuchal translucency (NT) scan measures a small area of fluid at the back of the baby's neck. Together with a blood test (the combined test), it estimates the chance of conditions such as Down syndrome. It is a screening test: a higher-chance result leads to an offer of further tests, not a diagnosis.
Anomaly scan (18 to 22 weeks)
Also called the level II or TIFFA scan, this detailed scan looks at the baby's brain, face, spine, heart, kidneys and limbs, and checks the placenta and amniotic fluid. It takes longer than other scans, so plan for some time at the clinic.
Growth scans in the third trimester
From around 28 to 32 weeks, a growth scan checks the baby's size, position, the fluid around the baby and blood flow (Doppler) where needed. Your obstetrician may repeat it if there is diabetes, high blood pressure, twins or concern about the baby's growth.
Are scans safe?
Medical ultrasound has been used in pregnancy for decades and is considered safe when done for a medical reason by trained staff. In India, sex determination is illegal under the PCPNDT Act, and the baby's sex is not disclosed at any scan.
See a specialist in Neelankarai, ECR
This guide is general information, not a diagnosis. Our Obstetrics & Gynaecology team at Healtree Multi-Speciality Centre & Hospital can assess your situation. The hospital is open 24 hours.
Specialists: Dr. R. Suganya, Dr. Hemalatha, Dr. Divya Subramani
Related services: Ultrasound & Doppler
Frequently asked questions
- Do I need a full bladder for a pregnancy scan?
- Sometimes, for early scans done over the tummy. The clinic will tell you when you book. Later scans usually do not need a full bladder.
- Can I bring my husband or a family member?
- Usually yes, one companion is welcome. Ask when you book in case of space limits on the day.
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