Washington is the latest state to require a simple and inexpensive test to screen all newborns for congenital heart defects.

The legislation was signed into law on last week and requires that all of the state’s newborns – nearly 87,000 per year — will get a pulse oximetry test. The requirements begin in late July.

Pulse oximetry tests blood oxygen levels using sensors placed on a newborn’s hand and foot. If levels are too low, more tests can be ordered that can uncover life-threatening heart defects, according to the American Heart Association.

Read more at blog.heart.org