To evaluate the respiratory function of the placenta and provide an indication of how the fetus will tolerate the stress of labor

To provide further information when a nonstress test is nonreactive

Explain the purpose and procedure involved with the oxytocin challenge test (OCT).

Instruct the patient that her contractions and the status of the fetus will be monitored electronically.

Assess the patient for possible contraindications such as unexplained third-trimester bleeding, preterm labor, placenta previa, multiple gestation, and a classic cesarean birth incision.

Tell the patient that an I.V. line will be started to administer the oxytocin.

Assess baseline maternal vital signs and fetal heart rate (FHR).

Place the patient in a semi-Fowler’s position or lateral tilt position with a pillow beneath one hip.

Start an I.V. infusion with normal saline or lactated Ringer’s solution.

Place a tocotransducer and an ultrasound transducer on the woman’s abdomen for 20 minutes to record baseline vital signs and measurements of uterine contractions, fetal movements, and FHR.