# Biophysical Profile

> NEET-PG OBG notes on biophysical profile covering the five Manning components, scoring of 0 or 2, interpretation of scores and management actions.

- Canonical URL: https://prepelephant.com/topics/neet-pg/obstetrics-and-gynaecology/biophysical-profile
- Exam / course: NEET-PG · Subject: Obstetrics and Gynaecology
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-02
- Last updated: 2026-10-02
- How to cite: "Biophysical Profile", PrepElephant, https://prepelephant.com/topics/neet-pg/obstetrics-and-gynaecology/biophysical-profile

## Direct answer

The biophysical profile (BPP) is a composite antenatal test of fetal wellbeing combining the non-stress test with four ultrasound variables — breathing, movements, tone and amniotic fluid volume — each scored 2 or 0 for a maximum of 10. It estimates the probability of chronic hypoxaemia, because the variables disappear in a predictable sequence as oxygenation fails, while amniotic fluid reflects the longer-term picture. A score of 8-10 is reassuring, 6 is equivocal and repeated within 24 hours (or delivery when mature or with oligohydramnios), and 4 or less generally mandates delivery at a viable gestation.

## What you must remember

- Components and thresholds: fetal breathing — at least one 30-second episode in 30 minutes; gross body movements — at least three; fetal tone — at least one extension-flexion episode; amniotic fluid volume — a deepest vertical pocket of 2 cm or more; plus the reactive non-stress test.
- Scoring: each variable scores 2 (normal) or 0 (absent or abnormal); 8-10 normal, 6 equivocal, 4 or less abnormal; the ultrasound part usually takes under 30 minutes when the fetus is well.
- Physiological gradient: with progressive hypoxaemia the variables are lost in reverse order of fetal appearance — reactivity first, then breathing, movements and finally tone; tone loss marks the pre-terminal state.
- Interpretation and action: 8-10 — repeat per risk protocol; 6 — repeat in 24 hours, delivering if mature, growth-restricted with abnormal Doppler or oligohydramniotic; 4 or less — deliver if viable.
- Oligohydramnios carries special weight at any score: it reflects chronic hypoxaemia with reduced fetal urine output, and with maturity or growth restriction it tips management toward delivery.
- Uses: second-line after a non-reactive non-stress test and for surveillance in growth restriction, post-term pregnancy, diabetes and hypertensive disease; correlates inversely with cord blood pH and perinatal mortality.
- Practical limits: false-positives occur with fetal sleep, maternal sedation, steroids, hyperglycaemia and smoking — interpret alongside gestation, Doppler and context.

## Common confusion

The BPP is treated as pass-fail, when its strength is gradation and the score-specific action ladder — a score of 6 is equivocal, not abnormal, and is repeated within 24 hours unless oligohydramnios, maturity or abnormal Doppler force delivery. Only amniotic fluid reflects chronic status; the other four respond to acute states such as fetal sleep or maternal sedation, which is why a low score is repeated rather than reflexively operated.

## Exam-focused takeaway

Stems quote component performance and ask for the score or next step — the 24-hour repeat for a score of 6 and delivery for 4 or less are the tested actions. Numeric thresholds (30-second breathing, three movements, one tone episode, 2 cm pocket) and the order of variable loss recur as one-liners.

## Frequently asked questions

### What are the five components of the biophysical profile?

Non-stress reactivity, fetal breathing, gross body movements, fetal tone and amniotic fluid volume — each scored 2 or 0, maximum 10.

### What thresholds define each ultrasound variable?

Breathing of 30 seconds in 30 minutes, three or more body movements, one or more extension-flexion tone episode, and a deepest vertical fluid pocket of 2 cm or more.

### What does a score of 6 mean?

An equivocal result — repeat the profile within 24 hours, unless oligohydramnios, lung maturity or abnormal Doppler with growth restriction indicates delivery.

### Why does amniotic fluid carry special weight?

Because it alone reflects chronic hypoxaemia — blood is redistributed away from the fetal kidneys, urine output falls and the pocket shrinks even when acute variables look acceptable.

### In what order are variables lost with fetal hypoxia?

Reactivity, then breathing, then movements, then tone — tone loss indicates pre-terminal compromise.