Patient's question:
Before, my health wasn't very good, and I was taking medication for treatment. As a result, I found out that I was pregnant with a child that I didn't originally want. But after thinking about it, I decided to keep the baby. Now, I have had a Down syndrome screening. How can a normal result be seen in a Down syndrome screening?Doctor's answer:
The critical value is 1/275. High risk is greater than low risk. The probability of having Down syndrome for the general population (under 37 years old) is 1/750. Down syndrome, also known as trisomy 21, is a congenital intellectual disability syndrome. It indicates that the patient has two extra pairs of chromosome 21 in their body compared to the normal two pairs in a healthy individual. It is the most common chromosomal aneuploidy disorder. Down syndrome screening is the most economical and simplest method to predict how mentally impaired a fetus might be. If the result is inconclusive, amniocentesis can be performed. Down syndrome screening is used to screen for trisomy 21, trisomy 18, and open neural tube defects. What is the likelihood of these three abnormalities?