Inpatient Obstetric Nurse (NCC) Practice Exam

How long should a maximum testing period be for a reactive NST for a term fetus?

1. 20 minutes

2. 30 minutes

3. 40 minutes

4. 60 minutes

The correct answer is: 40 minutes

The maximum testing period for a reactive non-stress test (NST) for a term fetus is generally considered to be 40 minutes. A reactive NST is defined by the presence of two or more accelerations of the fetal heart rate within a specified time frame, usually indicating that the fetus is well-oxygenated and not in distress. In practice, if a reactive result has not been achieved within 40 minutes, providers may reassess the situation as the likelihood of identifying a reactive pattern typically diminishes beyond this time frame. Testing beyond this period might lead to unnecessary prolonged monitoring without gaining additional clinically relevant information. Therefore, 40 minutes is the time frame that balances effective monitoring and patient care, ensuring timely decision-making if further intervention is necessary.