# Congenital Anomaly Counselling

> Congenital anomaly counselling — 18-22 week scan, soft markers, fetal medicine referral, MTP law — NEET-PG Obstetrics and Gynaecology notes.

- Canonical URL: https://prepelephant.com/topics/neet-pg/obstetrics-and-gynaecology/congenital-anomaly-counselling
- Exam / course: NEET-PG · Subject: Obstetrics and Gynaecology
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-02
- Last updated: 2026-10-02
- How to cite: "Congenital Anomaly Counselling", PrepElephant, https://prepelephant.com/topics/neet-pg/obstetrics-and-gynaecology/congenital-anomaly-counselling

## Direct answer

The anomaly scan at 18-22 weeks is the fulcrum of congenital anomaly care, and counselling around it proceeds in a fixed sequence: confirm the finding with a repeat or targeted examination, complete the foetal evaluation (echocardiography, Dopplers, karyotype or chromosomal microarray where indicated), give the prognosis in honest numbers — lethality, long-term disability, surgical correctability — and then lay out the lawful options: continue with a perinatal plan, or terminate under the Medical Termination of Pregnancy Act, whose 2021 amendment extends the ceiling to 24 weeks for specified categories and removes the gestational ceiling entirely where a Medical Board certifies a substantial foetal abnormality. Soft markers (echogenic intracardiac focus, choroid plexus cyst, mild hydronephrosis, echogenic bowel, short femur, nuchal thickening) are not anomalies — they adjust aneuploidy risk in isolation and usually mean nothing beyond it. The counselling session ends with written documentation, a second opinion offer, and a named next appointment; grief support and follow-up belong to the consultation, not an afterthought.

## What you must remember

- **The scan frame:** 18-22 weeks is the Indian standard anomaly window (11-14 weeks earlier detailed imaging for nuchal and nasal bone), with detection contingent on equipment, maternal habitus and position; a "not visualised" structure is a recall indication, not a normal result.
- **Soft-marker logic:** isolated markers in a low-risk screen-negative mother usually carry no action beyond adjusted risk counselling; a marker plus a screen-positive result or a second marker escalates to cfDNA or invasive testing; echogenic bowel in isolation additionally demands cystic fibrosis, infection (CMV, toxoplasma) and bleeding consideration.
- **Prognosis vocabulary worth knowing precisely:** lethal anomalies (anencephaly, bilateral renal agenesis, thanatophoric dysplasia — comfort care); severe disability with survival (open spina bifida, major congenital heart disease); surgically correctable with good outcome (gastroschisis versus the worse outlook of ruptured omphalocele with chromosomal association).
- **The MTP law ladder:** the MTP (Amendment) Act 2021 — up to 20 weeks on one doctor's opinion (failure of contraception ground extended to unmarried women); up to 24 weeks for specified categories (rape or incest survivors, minors, change of marital status, vulnerable groups per rules); beyond any ceiling, termination for substantial foetal abnormality on the decision of the State Medical Board, with no gestational limit fixed by the statute.
- **Fetal-medicine referral rule:** structural anomalies go to a maternal-fetal-medicine unit for targeted imaging, foetal echocardiography, microarray on amniocentesis, and where relevant, intrauterine therapy options — counselling without complete evaluation is premature.
- **Delivery-place planning:** anomalies needing immediate neonatal surgery or cardiac intervention deliver at a centre with paediatric surgery and cardiology, timing around 37-39 weeks for most (earlier for deteriorating foetal states), with a documented perinatal plan.
- **Grief and documentation:** for termination decisions, offer seeing and holding the baby, photographs, post-mortem discussion (confirmation of the diagnosis in 90-plus per cent of full perinatal autopsies is the standard counselling statistic), and a recurrence-risk consultation with pre-conceptional folic acid 4-5 mg for neural-tube recurrence.
- **Indian programme anchors:** the PC&PNDT Act governs the disclosure rules around sex and sex-selective disclosure is prohibited — anomaly counselling never includes sex selection; folic acid periconceptional prophylaxis (4 mg in high-risk, 400 mcg routinely) is the population-level prevention the counsellor references.

## A typical counselling case

A 27-year-old at 20 weeks is told her fetus has a lumbar spina bifida with ventriculomegaly of 14 mm. Sequence the consultation: first, complete the evaluation — targeted neuro-sonography (level, lesion size, head position), foetal echocardiography, offer amniocentesis with chromosomal microarray because 2-10 per cent of open spina bifida cases have aneuploidy, and document lower-limb movement and bladder function as functional prognosticators. Second, present the honest outcome spread — most survivors have hydrocephalus needing shunting, mobility varies with level, and bowel-bladder dysfunction is common; majority survival to school age. Third, the lawful options: continue with foetal-medicine follow-up (intrauterine repair meets MOMS criteria only at 19-26 weeks — the window is open for barely five more weeks) and delivery at a centre with neurosurgery; or terminate — at 20 weeks she is within the 20-week routine frame, and a Board pathway exists for later or more severe findings. Fourth, whatever the choice: written documentation, mental-health support, folic acid 4-5 mg pre-conception next time with a 4 per cent neural-tube recurrence risk (higher with prior affected pregnancy), and a named follow-up date. The consultation is a protocol, not a conversation improvised at the door.

## Where students slip

Two failures recur. The first is treating soft markers as diagnoses — recommending termination-level counselling for an isolated echogenic intracardiac focus in a screen-negative woman is the planted wrong answer; the correct action is risk-adjusted reassurance or escalation, proportionate to the marker. The second is misquoting the law: candidates freeze at "20 weeks" (the pre-2021 ceiling) when the stem's diagnosed anomaly, certified by a Medical Board, carries no ceiling at all, or they miss that the 24-week extension applies to specified categories. Third, incomplete evaluation before counselling — giving prognosis before echocardiography and karyotype in a structural anomaly skips the step the examiner's sequence question targets. Fourth, the perinatal plan omission: continuing pregnancies need a delivery-place and neonatal-team plan written into the notes. Finally, the PC&PNDT boundary — any stem drifting toward "family balancing" answers must be recognised and refused; the anomaly consultation is the lawful and ethical opposite of sex selection.

## Frequently asked questions

### When is the anomaly scan performed and what happens if a finding is suspected?

At 18-22 weeks, with suspected findings confirmed by targeted repeat imaging and completed by foetal echocardiography, Doppler studies and karyotype or microarray before counselling.

### What is the significance of an isolated soft marker such as an echogenic intracardiac focus?

In a low-risk, screen-negative pregnancy it usually carries no adverse significance beyond a small aneuploidy risk adjustment, whereas combined with other markers it escalates to cfDNA or invasive testing.

### What does the MTP Amendment Act 2021 allow for foetal abnormalities?

Termination for substantial foetal abnormalities at any gestation if a State Medical Board so decides, alongside a 24-week ceiling for specified categories of women and 20 weeks routinely.

### Which congenital anomalies are considered lethal for counselling purposes?

Anencephaly, bilateral renal agenesis with oligohydramnios, thanatophoric skeletal dysplasia and trisomy 13 — comfort-focused care is counselled as the standard pathway.

### What recurrence risk and prevention applies after a neural-tube-defect-affected pregnancy?

A recurrence risk of about 4 per cent, reduced substantially by periconceptional folic acid 4-5 mg daily starting before conception in the next pregnancy.