A non-stress test is prescribed for a pregnant mother and nurse informs the woman about the procedure. The nurse tells that:
1. The test is an invasive procedure and requires that an informed consent be signed
2. The test will take about 2 hours after procedure is completed
3. An ultrasound transducer that records fetal heart activity is secured over the abdomen where the fetal heart sound is heard most clearly
4. The fetus is challenged or stressed by uterine contractions to obtain the necessary information