A nonstress test is a noninvasive test that poses no physical risks for you or your baby. The term nonstress refers to the fact that nothing is done to place stress on the fetus during the test.
While a nonstress test can offer reassurance about your baby's health, it can cause anxiety, too. A nonstress test also might not detect an existing problem or might suggest that a problem exists when there is none, which can lead to further testing.
Also, keep in mind that while a nonstress test is often recommended for women who have an increased risk of pregnancy loss, it's not always clear if the test is helpful.