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Fetal monitoring (CTG)
CTG · fetal heart monitoring · non-stress test · baby heartbeat monitoring
A recording of your baby's heartbeat and the tightening of your womb. Two sensors on belts are placed on your belly. It is safe for you and your baby.
Usually from week 32 of pregnancy, to check on your baby. Also during labor, if the baby moves less, and for other reasons your doctor gives.
⏱ Duration: usually 20 to 40 minutes, sometimes up to an hour
Be sure to tell your doctor
How to prepare
- Food. Eat 1 to 2 hours before the test. Do not come hungry. Babies are usually more active after you eat.
- Before the test. Use the toilet. You will lie down for a while.
- Clothes. Wear something comfortable that lets you uncover your belly easily.
What to bring
- Your pregnancy records
- Water
How it goes
- You lie on your side or half sitting up. Lying flat on your back for long is best avoided
- Gel goes on your belly, and two sensors are held in place with belts
- One sensor listens to the baby's heart, the other measures your womb tightening
- Sometimes you get a button. Press it when the baby moves
- The machine records on paper or a screen
- If the baby is asleep, the recording may take longer
What you'll feel
- Nothing unpleasant, just the belts pressing and the cool gel
- You will hear your baby's heartbeat
Afterwards
- A doctor reads the recording, usually right away or the same day
- If the result is unclear, the test may be repeated. Most often the baby was just asleep
- You can go back to your day straight away
Contact a doctor straight away if
- Your baby is moving much less or has stopped moving
- Bleeding or leaking fluid
- Regular contractions or strong belly pain
- A bad headache, spots before your eyes, or swelling: call emergency services or your maternity hospital
Common questions
Is CTG harmful to my baby?
No. The sensor uses weak ultrasound, like a regular ultrasound scan. It is safe to do many times.
Why was I told to repeat the CTG?
Most often the baby was asleep, so the recording was quiet. It is usually repeated after you eat or take a walk.