Final answer:
The oxytocin challenge test, also known as the contraction stress test (CST), is used to evaluate the fetus's ability to withstand contractions during pregnancy.
Step-by-step explanation:
The oxytocin challenge test is another name for the contraction stress test (CST) which is used to evaluate the ability of the fetus to tolerate the stress of contractions during pregnancy. In this test, a synthetic form of oxytocin, called pitocin, is administered to stimulate contractions. The test is typically performed if there are concerns about the well-being of the fetus.