Obstetrics• Updated 21 October 2026
Fetal Heart Monitoring (CTG / NST)
A test that records the baby's heart rate and the mother's contractions in late pregnancy or labour.
Results: Immediately
Quick Summary
Primary Purpose
To check the baby's wellbeing, for example with reduced movements or in labour.
What It Measures
Baby's heart rate patterns and contractions.
Preparation
Eat normally beforehand.
Overview
A non-stress test (NST) is done before labour.
Two belts with sensors are placed on the tummy.
What It Measures
Fetal heart rate
Baseline and variations.
Contractions
Timing and strength.
How It's Performed
- 01
Belts
Placed on the tummy.
- 02
Record
For 20–40 minutes.
- 03
Review
By the doctor or midwife.
Interpreting Results & Next Steps
Discuss with Doctor
Your doctor will explain what your result means and what happens next.
If values are High:
Abnormal patterns may need further monitoring or delivery.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Nonstress Test(opens in a new tab) · MedlinePlus, US National Library of Medicine