A biophysical profile is a multiparameter approach to observing fetal well-being using a non-stress test and real-time ultrasound. The parameters assessed with real time ultrasound include:
- Fetal tone or the extension and flexion of fetal extremities
- Fetal movement or the observation of three distinct movements in a 30minute period.
- Fetal breathing or rhythmic movement of the chest wall lasting 30 seconds or more.
- Amniotic fluid volume or the presence of a single pocket of fluid exceeding 2 cm.
These findings are combined with the results of a non-stress test to determine the score of the biophysical profile.