At age 45, Naoko Chang said she couldn't have been more surprised to find out she was pregnant with her second child last fall.

But before she could even begin to enjoy her pregnancy, she faced a harsh reality — that given her age, the baby could have some sort of chromosomal abnormality.

Currently living in California, Chang was informed by her doctor of the risks of genetic defects to her baby, including Down syndrome, but was surprised and relieved when told by her doctor about a simple new blood test that could detect with a high level of accuracy several chromosomal abnormalities in fetuses.