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Health condition · Clinically reviewed

Down syndrome, antenatal screening, multi-system care and a lifelong specialist team.

The most common chromosomal condition - and one where structured screening, coordinated MDT care and family support genuinely change outcomes across a lifetime.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE, RCPCH, Down Syndrome Medical Interest Group (DSMIG-UK) and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK antenatal screening pathways including NIPT and lifelong specialist Down syndrome clinic care.

Key facts

Down syndrome at a glance.

The essentials, in plain English - what it is, the three karyotypes, how it is screened for, and why lifelong specialist care matters.

  • What it is

    A chromosomal condition caused by an extra copy of chromosome 21 (trisomy 21). It is the most common chromosomal disorder and the leading genetic cause of intellectual disability.

  • How common

    Around 1 in 700 to 1 in 1,000 UK live births after antenatal screening. Maternal age is the strongest single risk factor.

  • Three karyotypes

    Free trisomy 21 (about 95 per cent), Robertsonian translocation (about 4 per cent, can be inherited) and mosaicism (about 1 per cent, often milder).

  • Antenatal screening

    Combined test at 11 to 14 weeks, quadruple test at 14 to 20 weeks, and NIPT on the NHS since 2021 for higher-chance pregnancies. Diagnosis is by CVS or amniocentesis.

  • Multi-system

    Cardiac, gastrointestinal, endocrine, haematological, sensory, orthopaedic, neurological and cognitive features - all need lifelong surveillance.

  • Lifelong care

    Specialist paediatric and adult Down syndrome clinics, MDT input and structured screening make a real difference to outcomes and life expectancy.

Why this guide matters

Coordinated care, not scattered appointments.

Down syndrome touches every system. The three points below shape the rest of this page - and the way modern UK services deliver care.

  • Antenatal choice is informed

    Combined, quadruple and NIPT screening give expectant parents accurate information and time to make the decisions that are right for them.

  • Every newborn needs a workup

    An echocardiogram, TFTs, hearing and vision screen and feeding review in the first weeks set the foundation for a healthy life.

  • Specialist clinics change outcomes

    A paediatric or adult Down syndrome clinic, with an MDT and structured annual screening, is the single most useful thing a family can access.

How the diagnosis is made

From antenatal screening to a lifelong plan.

The pathway a UK team follows, in order - antenatal choice, confirmation, newborn workup and long-term surveillance.

  1. 01

    Antenatal

    Antenatal chance testing

    Combined test (nuchal translucency, bHCG, PAPP-A and maternal age) at 11 to 14 weeks, or quadruple test at 14 to 20 weeks.

  2. 02

    Antenatal

    NIPT for higher-chance pregnancies

    Cell-free fetal DNA testing, offered on the NHS since 2021 when combined or quadruple screening returns a higher chance result.

  3. 03

    Antenatal

    Diagnostic testing (offered)

    Chorionic villus sampling from 11 weeks or amniocentesis from 15 weeks, with full karyotype and microarray. Non-directive counselling always accompanies this.

  4. 04

    Newborn

    Newborn clinical suspicion

    Recognisable facial features, hypotonia, single palmar crease and brachydactyly prompt confirmation with rapid FISH and full karyotype.

  5. 05

    Newborn

    Karyotype and genetic subtype

    Distinguishes free trisomy 21, translocation (which warrants parental karyotyping) and mosaicism. Genetic counselling for the family follows.

  6. 06

    Surveillance

    Newborn multi-system workup

    Echocardiogram within the first weeks (cardiac disease affects roughly half), TFTs, hearing screen, red-reflex and feeding review.

  7. 07

    Surveillance

    Structured lifelong surveillance

    Down syndrome-specific growth charts, annual thyroid function, audiology, ophthalmology, coeliac screening and, in adulthood, cognitive review.

Typical pathway: a diagnosis confirmed in days, a plan that lasts a lifetime.

Features

What Down syndrome actually looks like.

A multi-system condition - from newborn features and heart defects to lifelong endocrine, sensory and neurological surveillance.

  • Facial features

    Upslanting palpebral fissures, epicanthic folds, flat nasal bridge, small mouth with a relatively protruding tongue and small ears.

  • Hand and foot signs

    Single palmar crease, short broad hands (brachydactyly), incurving fifth finger (clinodactyly) and a wide gap between the first and second toes.

  • Hypotonia and delayed milestones

    Low muscle tone from birth and delayed sitting, walking, feeding and speech - all improved by early physiotherapy and speech and language therapy.

  • Congenital heart disease

    Around half of babies have a structural heart defect - most often an atrioventricular septal defect, VSD, PDA or tetralogy of Fallot. See our guide to congenital heart defects in children.

  • Gastrointestinal and coeliac

    Duodenal atresia, Hirschsprung disease, reflux and constipation are more common, and coeliac disease affects around 5 to 10 per cent.

  • Endocrine and haematological

    Hypothyroidism (up to 30 per cent lifetime), diabetes and growth issues; transient abnormal myelopoiesis in newborns and increased risk of AML and ALL.

  • Sensory and orthopaedic

    Hearing loss in around three quarters (conductive and sensorineural), refractive errors, cataract, strabismus, keratoconus and atlantoaxial instability in around 15 per cent.

  • Red flag - dementia and OSA

    Obstructive sleep apnoea affects around half; early-onset Alzheimer disease is common from the 40s and warrants specialist memory-clinic follow-up.

Care

How Down syndrome is cared for in the UK.

Specialist Down syndrome clinics coordinate an MDT - cardiology, endocrinology, audiology, ophthalmology, therapies, education and adult services.

  • Specialist Down syndrome clinic

    The backbone of care - a paediatric or adult Down syndrome clinic coordinates screening, referrals, growth monitoring and family support in one place.

  • Cardiology and cardiac surgery

    Early echocardiogram for every baby, timely repair of AVSD, VSD, PDA or tetralogy of Fallot, and lifelong congenital cardiology follow-up.

  • Endocrine surveillance

    Annual thyroid function, monitoring for diabetes and growth review against Down syndrome-specific charts; treatment as needed.

  • Audiology and ENT

    Newborn hearing screening, annual audiology, glue-ear management, hearing aids or cochlear implants when appropriate.

  • Ophthalmology

    Regular vision checks, refractive correction, and treatment of cataract, strabismus and keratoconus - vision underpins learning.

  • Therapies and education

    Physiotherapy, speech and language therapy, occupational therapy, Portage, specialist teaching and an EHCP where indicated.

  • Mental health and memory clinic

    Screening for depression, anxiety and autism throughout life, and a specialist Down syndrome memory clinic for adult dementia care.

  • Genetic counselling and support

    Karyotype-based counselling for the family, cascade testing when a translocation is found, and links to the Down Syndrome Association, Down's Syndrome Scotland, Mencap and Contact.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your paediatrician, GP or specialist Down syndrome clinic knows your family and history and can tell you which parts apply to you. If in doubt, get seen.

  • NHS Fetal Anomaly Screening Programme (FASP). Screening for Down's syndrome, Edwards' syndrome and Patau's syndrome.

  • Down Syndrome Medical Interest Group UK (DSMIG-UK). Medical surveillance essentials.

  • RCPCH. Health checks for children and young people with Down syndrome.

  • NICE. Antenatal care (NG201) and learning disability guidance.

  • Down Syndrome Association (UK). Health, education and family resources.

Red flags

When Down syndrome needs urgent attention.

Most surveillance is scheduled and calm. These are the situations that need same-day or specialist attention instead.

  • Newborn cyanosis or heart failure

    Poor feeding, tachypnoea, sweating and cyanosis suggest a duct-dependent or large left-to-right shunt - urgent neonatal and cardiology review.

  • Bilious vomiting in a newborn

    Consider duodenal atresia - a same-day surgical assessment is needed.

  • Delayed passage of meconium

    Raises the possibility of Hirschsprung disease - paediatric surgical referral for rectal biopsy.

  • Atlantoaxial instability symptoms

    Neck pain, torticollis, gait change, incontinence or new weakness warrants urgent imaging and neurosurgical input.

  • Snoring, apnoeas or daytime sleepiness

    Obstructive sleep apnoea affects around half and needs sleep-study assessment and treatment.

  • Sudden cognitive or behavioural decline in adulthood

    Consider early-onset Alzheimer disease, hypothyroidism, depression or sensory loss - a specialist Down syndrome memory clinic can differentiate them.

  • Unexplained bruising or fatigue

    Increased risk of leukaemia (AML and ALL) - urgent FBC and haematology review.

  • Chronic diarrhoea or poor growth

    Screen for coeliac disease and hypothyroidism, both common in Down syndrome.

  • Sudden vision change

    Cataract and keratoconus are more common - same-week ophthalmology assessment.

Living with it

A lifelong condition, with a clear team.

Four things that make the biggest difference across a lifetime - one coordinated team, structured annual screening, early therapies and a planned transition to adult services.

A quiet reminder

People with Down syndrome are people first.

Medical care matters, but so do school, work, relationships and community. Good services support all of it.

  1. 01 Team

    One coordinated team

    A specialist Down syndrome clinic keeps paediatrics, cardiology, endocrinology, audiology and therapies moving in the same direction.

  2. 02 Screening

    Keep the annual checks going

    Thyroid, hearing, vision, coeliac and growth reviews every year make a measurable difference across childhood and adulthood.

  3. 03 Learning

    Early intervention and education

    Portage, speech and language therapy, specialist teaching and an EHCP where needed unlock genuine progress.

  4. 04 Adulthood

    Plan transition to adult services

    Adult congenital heart clinics, learning-disability services and a Down syndrome memory clinic keep care joined up after 18.

Frequently asked

Everything we get asked about Down syndrome.

Quick answers on karyotypes, NIPT, heart surgery, education, transition to adulthood and Alzheimer disease.

  • What causes Down syndrome?

    An extra copy of chromosome 21. About 95 per cent of cases are free trisomy 21 (non-disjunction during maternal meiosis, with age-related risk), about 4 per cent are Robertsonian translocations (which can be inherited) and about 1 per cent are mosaic, where only some cells carry the extra chromosome. Karyotyping identifies which type is present and guides family counselling.

  • How is Down syndrome screened for during pregnancy?

    The NHS offers the combined test at 11 to 14 weeks (nuchal translucency, bHCG and PAPP-A with maternal age) or the quadruple test at 14 to 20 weeks. Since 2021, non-invasive prenatal testing (NIPT) on cell-free fetal DNA has been offered on the NHS for higher-chance pregnancies. Diagnosis is by chorionic villus sampling or amniocentesis with full karyotype.

  • What health problems are more common in Down syndrome?

    Around half have congenital heart disease (most often an AVSD), and there are higher rates of hypothyroidism, hearing and vision problems, coeliac disease, obstructive sleep apnoea, atlantoaxial instability, leukaemia in childhood and early-onset Alzheimer disease in adulthood. Structured annual screening picks these up early.

  • Will my child need heart surgery?

    Around half of babies with Down syndrome have a heart defect and many need surgery, most often for an atrioventricular septal defect, VSD, PDA or tetralogy of Fallot. Every newborn should have an echocardiogram in the first weeks of life, and paediatric cardiology decides on timing.

  • What education and therapy support is available?

    Early intervention makes the biggest difference. Portage, speech and language therapy, physiotherapy and occupational therapy start in infancy, and specialist teaching, inclusive education and an EHCP support school years. The Down Syndrome Association, Down's Syndrome Scotland, Mencap and Contact provide family support.

  • What happens in adulthood, and what about Alzheimer disease?

    Adults with Down syndrome move to adult congenital heart, learning-disability and Down syndrome-specific clinics. Almost everyone develops the brain amyloid pathology of Alzheimer disease and many develop clinical dementia from their 40s, which is why a specialist Down syndrome memory clinic and, increasingly, trials of anti-amyloid therapies matter.

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