Trisomy 18, also known as Edwards Syndrome, is a genetic condition caused by an extra chromosome 18. Diagnosis can be made prenatally (in utero) or after birth.

Symptoms of Edwards syndrome (trisomy 18) typically include poor growth before and after birth, multiple birth defects and severe developmental delays or learning problems. Symptoms are …

Most babies with trisomy 18 will have abnormal ultrasound findings during pregnancy. These findings might be seen in the first trimester, but they are more commonly seen during a second …

Find out about Edwards’ syndrome (trisomy 18) including the symptoms, types, how it's diagnosed and what causes it.

Apr 8, 2014 · Trisomy 18 can be detected before birth by several tests. These include maternal serum analysis or screening, ultrasonography, amniocentesis, and chorionic villus sampling.

Many parents opt to have routine screening for Edwards syndrome (alongside Down syndrome and Patau syndrome), and signs are typically evident on prenatal ultrasounds.

There are 3 types of chromosome findings found in persons with Edwards syndrome. About 95% of infants will have a full or complete trisomy in all body cells.

Nov 12, 2025 · In 5-10% of infants with Trisomy 18, only a portion of their cells may contain the extra chromosome 18 (called the mosaic type of Trisomy 18). Infants with Trisomy 18 will …

It is usually assumed that if the parents of a person with trisomy 18 have the usual two copies of chromosome 18, then the extra 18 in their child was a result of an egg or sperm with 24 …

Apr 24, 2025 · Edwards syndrome can also be diagnosed at birth because there are key physical features that your doctor can see. If the doctor thinks your baby has Edwards syndrome, the …