The OTC test, or oxytocin provocation test, is one of the techniques used to detect intrauterine fetal status, and can be used for prenatal monitoring and evaluation of placental function during induction of labor. The OTC test involves the use of contractions induced by the use of contractogens while the changes in fetal heart rate are recorded by an electronic fetal heart rate monitor. The results can be determined as negative, suspicious, or positive for whether or not there is a variable deceleration or late deceleration on the electronic fetal heart rate monitor. Negative results indicate good placental reserve; positive results require cessation of contractions, change of position, etc.; suspicious results require repeat testing. Some people may experience pain during this procedure. In high-risk pregnancies with placental insufficiency and those who do not respond to the non-stress test, this method can be used for prenatal monitoring, in order to detect fetal abnormalities at an early stage and provide timely treatment. The test should not be performed in cases of suspected severe intrauterine distress, preeclampsia, or multiple pregnancies.