Ultrasound scans are one of the most reassuring parts of antenatal care. They let your doctor see how your baby is growing and developing — all using safe sound waves, not radiation. This guide explains the common scans, roughly when each one happens, and what they check, with the India-specific rules you should know.
Quick Answer
Ultrasound is safe (it uses sound waves, not radiation) and is a routine part of pregnancy care. The common scans are: a dating / early scan (around 6–9 weeks), the NT scan (around 11–14 weeks), the anomaly / TIFFA scan (around 18–22 weeks), and a growth scan in the third trimester if needed. Extra scans are added if your doctor needs to check something specific. In India, finding out or revealing the baby’s sex is illegal under the PCPNDT Act. Your doctor decides exactly which scans you need and when.
What is an Ultrasound & Is It Safe?
An ultrasound creates pictures of your baby using high-frequency sound waves. A probe sends sound into the womb, and the echoes are turned into an image on a screen. Because it uses sound — not X-rays or any radiation — routine pregnancy ultrasound is considered safe for you and your baby, which is why it’s used so often during pregnancy.
Scans are diagnostic, not harmful. They help your doctor confirm the pregnancy, track growth, and pick up problems early so they can be managed in time.
The Common Scans & When
Every pregnancy is a little different, so treat these timings as a general guide rather than fixed dates.
- Dating / early scan (~6–9 weeks): Often the first scan. It can confirm the pregnancy, check the heartbeat, see how many babies there are, and work out your due date.
- NT scan (Nuchal Translucency, ~11–14 weeks): Part of first-trimester screening for chromosomal conditions such as Down syndrome. It is often combined with a blood test — together called the combined or dual test — to estimate the chance of certain conditions.
- Anomaly / TIFFA scan (~18–22 weeks): A detailed scan that examines the baby’s organs and overall structure to look for abnormalities. This is an important scan in pregnancy.
- Growth scan (third trimester, if needed): Checks the baby’s size, the placenta, the amount of fluid, and blood flow (a Doppler study). It’s done when your doctor wants to keep a closer eye on growth and wellbeing.
- Extra scans if needed: If anything needs checking, or in higher-risk pregnancies and twins, your doctor may advise additional scans.
What Each Scan Checks
- The dating scan answers the basics: Is there a heartbeat? One baby or more? When is the due date?
- The NT scan + blood test estimates the likelihood of chromosomal conditions. It is a screening test — it gives a risk, not a yes/no diagnosis.
- The anomaly/TIFFA scan looks carefully at the brain, spine, heart, kidneys, limbs and other structures to check development.
- The growth scan with Doppler confirms the baby is growing well and that the placenta and blood flow are supporting the pregnancy.
If a scan raises a question, your doctor may repeat it later or suggest another test. A single finding rarely tells the whole story on its own.
A Note on Safety
Routine ultrasound during pregnancy is considered safe and is not the same as an X-ray. There’s no radiation involved, which is why scans can be done more than once when there’s a medical reason. Try not to worry about the scan itself being harmful — the purpose is to keep an eye on your baby’s health, not to put it at risk.
India & the Law — No Sex Determination
This is important and specific to India. Under the PCPNDT Act (Pre-conception and Pre-natal Diagnostic Techniques (Prohibition of Sex Selection) Act, 1994), finding out or revealing the baby’s sex from an ultrasound is illegal. The law exists to prevent sex-selective abortion.
So clinics and doctors will not — and must not — tell you whether you’re having a boy or a girl, and you shouldn’t ask. This is completely normal and lawful; it is not the clinic being unhelpful or hiding something. Always go to a registered, qualified centre for your scans.
Scans Don’t Replace Your Check-Ups
Ultrasound is one part of antenatal care, not the whole of it. Keep attending your regular check-ups and doing the blood tests and other screening your doctor advises. Scans complement these — they don’t replace them.
Just as important: don’t wait for your next scheduled scan to report a problem. If something feels wrong, tell your doctor straight away.
When to See a Doctor
Attend all your scheduled scans, but contact your doctor right away, regardless of when your next scan is, if you have:
- Vaginal bleeding
- Abdominal pain or cramping
- Leaking fluid
- Reduced or noticeably changed fetal movements
Don’t wait for a scan to flag these. And whatever your scan report says, let your doctor explain it — don’t self-interpret the report. The numbers and terms in a scan report mean different things in different contexts, and your doctor is the right person to read them.
Indian Context
A few practical points for pregnancies in India:
- Choose a registered, qualified ultrasound centre — this is both safer and legally required.
- Don’t ask for the baby’s sex. Clinics cannot share it; this protects both you and them under the PCPNDT Act.
- Don’t self-read your reports off the internet. A confusing-sounding line is best explained by your obstetrician, who knows your full history.
- Scan costs and availability vary by city and centre, so confirm with your doctor in advance which scans they recommend and when.
Frequently Asked Questions
Q: How many ultrasound scans will I have during pregnancy?
A: It depends on your pregnancy. Many women have a few — typically a dating scan, an NT scan, an anomaly/TIFFA scan, and a growth scan if needed. Higher-risk pregnancies or twins may need more. Your doctor decides what’s right for you.
Q: Is ultrasound safe for my baby?
A: Yes. Routine ultrasound uses sound waves, not radiation, and is considered safe. It is not the same as an X-ray.
Q: Why won’t the clinic tell me my baby’s sex?
A: Because it’s illegal in India under the PCPNDT Act, which exists to prevent sex-selective abortion. No clinic can legally tell you, and you shouldn’t ask. This is normal and lawful.
Q: What if my scan report says something I don’t understand?
A: Don’t try to interpret it yourself. Take it to your doctor, who can explain it in the context of your full pregnancy and advise on any next steps.
Q: Can I skip a scan if I feel completely fine?
A: It’s best to attend all the scans your doctor recommends, as some problems have no symptoms early on. If you have any concern between scans, contact your doctor straight away rather than waiting.
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This article is for general information and is not a substitute for personalised medical advice. Always consult your obstetrician.