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Down syndrome (Trisomy 21)

New Clue to Why Chromosomal Birth Defects More Likely in Older Mothers

Down syndrome, the most common birth defect affectin ... more »

Down Syndrome Risk Calculator

Down syndrome is also known as "Trisomy 21" which is a genetic disorder caused by the presence of extra genetic material from part or all of an extra 21st chromosome.  Down syndrome is named after John Langdon Down, the British doctor who describe ... more »

Identical Twins Reveal How One Extra Chromosome Upsets the Entire Genome

Approximately one baby out of every 800 has Down syndrome, also known as trisomy 21. A rare opportunity led to the discovery that the chromosome abnormality that causes trisomy 21 seems small but it upsets the entire genome. ... more »

Women 35+ Less Likely to Have Babies with Anatomical Defects

Women over the age of 35 are more prone to having children with chromosomal abnormalities such as Down syndrome but, according to the findings ... more »

New Study Explains High Number of Chromosome Errors in Human Eggs

As many as 60% of a woman's eggs are thought to be defective by errors in chromosomal division. These errors represent the number-one cause of infertility. ... more »

New Down Syndrome DNA Test 10 Times More Accurate

Approximately one in every 700 pregnancies in the United States involves an abnormality of the chromosomes, a condition that results in incurable medical conditions such as Down syndrome. ... more »

Down Syndrome (Trisomy 21)

Down syndrome is a genetic disorder caused by a duplicati ... more »

Some Down Syndrome Markers More Important Than Others

During the second trimester, ultrasound can be used to not ... more »

Are Chromosomal Disorders Inherited?

Although it is possible to inherit some types of chromosomal abnormalities, most chromosomal disorders (such as Down syndrome and Turner syndrome) are not passed from one generation to the next. ... more »

Can Changes in the Number of Chromosomes Affect Health and Development?

Human cells normally contain 23 pairs of chromosomes, for a total of 46 chromoso ... more »

Alpha-Fetoprotein (Serum) During Pregnancy

What is Alpha-Fetoprotein? ... more »

Getting Screened for First-Trimester Down Syndrome can be a Tough Decision

Down syndrome is on every pregnant woman’s mind. The onset of Down Syndrome has been linked to different conditions during gestation, but there is really no concrete evidence about its true cause. ... more »

Advanced Maternal Age and Pregnancy

When a woman becomes pregnant past the age of 35, she is ... more »

New Blood Test Detects Down Syndrome Early in Pregnancy

Obstetricians are constantly looking for better ways to diagnose Down syndrome. ... more »

BPA Could Increase Down Syndrome Risk in Unborn Fetus

Researchers report developmental changes in the oocytes and undeveloped ova af ... more »

Designer Babies Could be Tested to Perfection

With the development and perfection of genetic testing, every chromosome in the human body can be tested for faults and defects. ... more »

New Test for Trisomy 21 Less Invasive

The age at which women are choosing to start a family is getting older and older. With increased age comes a greater risk of Down Syndrome (Trisomy 21) at birth. ... more »

Down Syndrome - Ultrasound Sonogram Markers

There are several ultrasound markers for Down syndrome which can be seen on sonogram during pregnancy and which can possibly indicate an increased risk for the fetus having Down syndrome. ... more »

The Quad Screen Test

During the 40 weeks of pregnancy gestation, there will be a wealth of tests offered t ... more »