@genetic-counselor
Genetic Counselor
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Down syndrome affects multiple organ systems, and screening for these is a standard part of care rather than an exception. Common associated conditions include:
Cardiac System
– Congenital heart defects occur in roughly 40-50% of babies with Down syndrome — most commonly atrioventricular septal defect (AVSD), ventricular septal defect (VSD), and patent ductus arteriosus (PDA)
– An echocardiogram is recommended for every newborn with Down syndrome, even if no symptoms are apparent, since some defects are not immediately obvious on physical examEndocrine System
– Congenital hypothyroidism and acquired thyroid dysfunction (both hypo- and hyperthyroidism) are more common and can affect growth and cognitive development if untreated
– Thyroid function tests are typically recommended at birth and annually thereafterHearing and Vision System
– Conductive hearing loss is common, often due to recurrent ear infections and structural differences in the ear canal
– Vision issues include refractive errors, strabismus (squint), and cataracts
– Routine hearing and vision screening is recommended starting in infancyGastrointestinal System
– Higher incidence of duodenal atresia, Hirschsprung’s disease, and celiac disease
– Some GI anomalies (like duodenal atresia) present at birth and require surgical correction; celiac disease may need screening later in childhoodMusculoskeletal System
– Hypotonia (low muscle tone) is near-universal and affects early motor milestones
– Atlantoaxial instability (looseness in the upper spine) occurs in a subset of children and is relevant if the child will be involved in contact sports or gymnastics — screening X-rays may be advised in specific casesHematologic System
– Increased risk of transient abnormal myelopoiesis in newborns and a higher lifetime risk of leukemia (both AML and ALL) compared to the general population, though absolute risk remains low
– Routine blood counts are part of standard follow-upRespiratory and Immune System
– Increased susceptibility to respiratory infections
– Higher rates of obstructive sleep apnea, related to differences in airway anatomy and low muscle tonenone of these conditions are universal, and most are manageable with early detection. The standard approach is a structured follow-up schedule — cardiac evaluation at birth, thyroid checks annually, and regular pediatric, ENT, and ophthalmology review — rather than reactive treatment after symptoms appear. Not everyone with Down syndrome will present every symptom associated with it, they are at risk for developing the above mentioned conditions.
Advanced maternal age is considered as a risk factor for having a child with Down Syndrome. The likelihood increases with maternal age, particularly after the age of 35 years, though most babies with Down syndrome are still born to mothers under 35 years of age. The risk of having a child with Down syndrome is slightly increased if the mother is over 35 years of age compared to rest of the population.
Usually not. About 95% of cases occur due to a random error, not something inherited. A small percentage (around 3-4%) result from a “translocation” form, which can be inherited from a parent who carries a balanced translocation, genetic counseling will be helpful in planning for future pregnancies in risk estimation.
It occurs due to an error in cell division (nondisjunction) that results in an extra chromosome 21. In most cases, this happens randomly during the formation of the egg or sperm and is not inherited from either parent.
Down syndrome is a genetic condition caused by an extra copy of chromosome 21 (trisomy 21). It affects physical development, cognitive ability, and is associated with certain health conditions, but the degree varies widely from person to person.
Genetic testing analyzes the DNA, chromosomes, or proteins to identify changes or mutations associated with inherited disorders, disease risks, or other health conditions. A small sample, usually blood or saliva, is collected and used to look for changes in specific genes. The sample is processed in a lab by specialists, and the results are interpreted by a geneticist who explains what they mean for those with genetic disease or their family.
Genetic testing may help if an individual has unexplained symptoms, a family history of a genetic condition, are planning a pregnancy, have had recurrent miscarriages, or have been diagnosed with certain cancers at a young age or if suspected to be due to a genetic cause. A genetic counseling session with an expert can help determine if testing is right for depending on their situation and condition.
Certain signs and symptoms seen in an individual point toward a genetic cause, such as a health condition appearing in multiple family members, developmental delay, unexplained health issues from early childhood, or repeated pregnancy loss. A geneticist can review an individual’s family history and guide them on whether testing is useful.
No. Some genetic conditions run in families, but others happen due to a new change in the genetic material that neither parent carries. This is why a family with no history of a condition can still have a child affected by one.
A genetic disease is a health condition caused by a change in one or more genes or genetic material of an individual. These changes can be inherited from parents or can occur on their own over an individual’s lifetime. Genetic conditions can appear during a pregnancy, at birth or can even show up later in childhood or adulthood.
