Several tests can be done to check for the presence of Down’s Syndrome. Nowadays these tests are more precise than 10 years ago.
“There are two types of procedures available for pregnant women: screening tests and diagnostic tests. The screening tests estimate the risk of the baby having Down syndrome. Diagnostic tests tell whether or not the baby actually has Down syndrome.”
“At this time the most commonly used screening test is “The Triple Screen.” This is a combination of three tests that measure quantities of various substances in the blood. These tests are usually done between 15 and 20 weeks of pregnancy.
Sonograms (ultrasounds) are usually performed in conjunction with other screenings. They show some physical traits that are helpful in calculating the risk of Down Syndrome; however screening tests do not accurately confirm the diagnosis of Down syndrome. In fact, both false positives and false negatives frequently occur” (Facts About Down Syndrome).
