Total biophysical profile (BPP) score is the sum of five biophysical components, each scored 0 or 2.

Component	Score 2 (normal)	Score 0 (abnormal)
Fetal breathing movements	At least one episode of rhythmic breathing lasting ≥30 seconds within a 30-minute observation.	Breathing movements absent or not meeting the duration criterion.
Gross body movements	Three or more discrete body or limb movements in 30 minutes.	Two or fewer discrete movements in 30 minutes.
Fetal tone	At least one episode of active extension with return to flexion of limb(s) or trunk, such as hand opening and closing.	Slow or incomplete return to flexion, or no observed movement.
Amniotic fluid volume	At least one pocket of amniotic fluid with deepest vertical dimension ≥2 cm, or amniotic fluid index within the local normal range.	No qualifying pocket or oligohydramnios by local criteria.
Non-stress test (NST)	Reactive fetal heart rate tracing with at least two accelerations of ≥15 bpm lasting ≥15 seconds in 20–40 minutes.	Non-reactive or unsatisfactory tracing.

Each normal component scores 2 and each abnormal component scores 0. Total BPP score range: 0-10.

Fetal Biophysical Profile (BPP) Score