The short explanation
The anomaly scan, usually done between about the eighteenth and twenty-second week, is a detailed ultrasound that checks how the baby is developing. The sonologist looks at the baby's head, brain, face, spine, heart, stomach, kidneys, arms and legs, and also checks the position of the placenta, the amount of fluid and the baby's growth. Most scans show no concerns. If something is seen, it may be a minor finding that often resolves, or something that needs a repeat scan, a scan by a specialist or further tests. The doctor will explain what was seen and what it could mean before any decision is made.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- An ultrasound cannot detect every condition, and some findings are only visible later in pregnancy or after birth.
- The baby's position, your body size and the stage of pregnancy can make some parts hard to see, in which case a repeat scan is common and is not a sign of a problem.
- In India the scan must not be used to tell parents the sex of the baby; this is illegal under the PCPNDT Act.
- Costs differ widely between government and private centres, so ask in advance.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This cannot tell you what your own scan will show or what any finding means for your baby. Only the doctor reviewing your report can explain that.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- What did the scan check, and was everything seen clearly?
- Is any finding something that needs a repeat or specialist scan?
- Where is the placenta, and does that need follow-up?
- Who can I talk to if the result worries me?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Emergency — call 112 now
- Call 112 or go to the nearest emergency department if you have heavy bleeding, a gush of fluid, severe belly pain or fainting at any point.
Book an appointment soon
- See your doctor within a few days if you have a report you do not understand or were told to arrange further tests.
Raise it at a routine appointment
- Book the anomaly scan in the window your doctor recommends, usually around the middle of pregnancy.
Sources
The evidence this explanation is built on.
- Prenatal care MedlinePlus (NIH)
- Pregnancy MedlinePlus (NIH)
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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