For a breathing movement score on a BPP, how long must the episode last to receive a score of 2?

A breathing movement score on a Biophysical Profile (BPP) assesses the presence of respiratory movements in the fetus, which is an important indicator of fetal well-being. To receive a score of 2 for breathing movements, the episode must last at least 30 seconds.

The rationale behind this is that a duration of 30 seconds indicates a sustained and significant respiratory effort from the fetus, suggesting proper neurological function and sufficient oxygenation. Shorter episodes may not reliably reflect the fetus's ability to breathe independently or its overall health. Thus, the standard criterion for scoring is set at this specific duration to ensure that the assessment provides meaningful data regarding fetal wellbeing.