Labor, Delivery, and Postpartum Care
FAQ015, February 2018



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Fetal Heart Rate Monitoring During Labor

What is fetal heart rate monitoring?

Fetal heart rate monitoring is the process of checking the condition of your fetus during labor and delivery by monitoring your fetus's heart rate with special equipment.

Why is fetal heart rate monitoring done during labor and delivery?

Fetal heart rate monitoring may help detect changes in the normal heart rate pattern during labor. If certain changes are detected, steps can be taken to help treat the underlying problem. Fetal heart rate monitoring also can help prevent treatments that are not needed. A normal fetal heart rate can reassure both you and your obstetrician–gynecologist
(ob-gyn)
or other health care professional that it is safe to continue labor if no other problems are present.

What are the types of monitoring?

There are two methods of fetal heart rate monitoring in labor. Auscultation is a method of periodically listening to the fetal heartbeat. Electronic fetal monitoring is a procedure in which instruments are used to continuously record the heartbeat of the fetus and the contractions of the woman's uterus during labor. The method that is used depends on the policy of your ob-gyn or hospital, your risk of problems, and how your labor is going. If you do not have any complications or risk factors for problems during labor, either method is acceptable.

How is auscultation performed?

Auscultation is done with either a special stethoscope or a device called a Doppler transducer. When the transducer is pressed against your abdomen, you can hear your fetus's heartbeat.

When auscultation is used, your ob-gyn or other health care professional will check the heart rate of the fetus at set times during labor. If you have risk factors for problems during labor or if problems appear during labor, the fetal heart rate will be checked and recorded more frequently.

How is electronic fetal monitoring performed?

Electronic fetal monitoring uses special equipment to measure the response of the fetus’s heart rate to contractions of the uterus. It provides an ongoing record that can be read. Your ob-gyn or other health care professional will review the electronic recording of the fetus’s heartbeat (called the fetal heart rate tracing) at set times. The tracing may be reviewed more frequently if problems arise.

Electronic fetal monitoring can be external, internal, or both. You may need to stay in bed during both types of electronic monitoring, but you can move around and find a comfortable position.

How is external monitoring performed?

With this method, a pair of belts is wrapped around your abdomen. One belt uses Doppler to detect the fetal heart rate. The other belt measures the length of contractions and the time between them.

How is internal monitoring performed?

With this method, a wire called an electrode is used. It is placed on the part of the fetus closest to the cervix, usually the scalp. This device records the heart rate. Uterine contractions also may be monitored with a special tube called an intrauterine pressure catheter that is inserted through the vagina into your uterus. Internal monitoring can be used only after the membranes of the amniotic sac have ruptured (after "your water breaks" or is broken).

What happens if the fetal heart rate pattern is abnormal?

Abnormal fetal heart rate patterns do not always mean there is a problem. Other tests may be done to get a better idea of what is going on with your fetus.

If there is an abnormal fetal heart rate pattern, your ob-gyn or other health care professional will first try to find the cause. Steps can be taken to help the fetus get more oxygen, such as having you change position. If these procedures do not work, or if further test results suggest your fetus has a problem, your ob-gyn or other health care professional may decide to deliver right away. In this case, the delivery is more likely to be by cesarean birth or with forceps or vacuum-assisted delivery.

Glossary

Amniotic Sac: Fluid-filled sac in the mother’s uterus in which the fetus develops.

Auscultation: A method of listening to internal organs, such as the fetal heart during labor.

Cervix: The lower, narrow end of the uterus at the top of the vagina.

Cesarean Birth: Birth of a baby through incisions made in the mother’s abdomen and uterus.

Doppler Transducer: A device that uses sound waves to reflect motion—such as the fetal heartbeat—in the form of signals that can be heard.

Electrode: A small wire that is attached to the scalp of the fetus to monitor the heart rate.

Electronic Fetal Monitoring (EFM): A method in which electronic instruments are used to record the heartbeat of the fetus and contractions of the mother’s uterus.

Fetus: The stage of prenatal development that starts 8 weeks after fertilization and lasts until the end of pregnancy.

Forceps: Special instruments placed around the baby’s head to help guide it out of the birth canal during delivery.

Obstetrician–Gynecologist (Ob-Gyn): A physician with special skills, training, and education in women’s health.

Vacuum-Assisted Delivery: The use of a special instrument attached to the baby’s head to help guide it out of the birth canal during delivery.

If you have further questions, contact your obstetrician–gynecologist.

FAQ015: Designed as an aid to patients, this document sets forth current information and opinions related to women’s health. The information does not dictate an exclusive course of treatment or procedure to be followed and should not be construed as excluding other acceptable methods of practice. Variations, taking into account the needs of the individual patient, resources, and limitations unique to institution or type of practice, may be appropriate.

Copyright February 2018 by the American College of Obstetricians and Gynecologists. No part of this publication may be reproduced, stored in a retrieval system, posted on the Internet, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher.

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