A BPP is
commonly done in the last
trimester of pregnancy. If there is a chance that your
baby may have problems during your pregnancy (high-risk pregnancy), a BPP may be done by 32 to 34 weeks or earlier. Some women
with high-risk pregnancies may have a BPP test every week or twice a week in
the third trimester.
Why It Is Done
A biophysical profile (BPP) test is done
Learn about and keep track of your baby's
health. Special ultrasound methods are used to keep track of movement,
increases in heart rate with movement (nonstress test), muscle tone, breathing
rate, and the amount of amniotic fluid (amniotic fluid index) surrounding your baby. If these five areas are within a normal
range, your baby is considered to be in good health.
A small amount of amniotic
fluid (oligohydramnios) or too much amniotic fluid
A multiple pregnancy (such as twins or
A pregnancy that has gone past your due date, between 40 and
How To Prepare
You may need a full
bladder for the test. If so, you will be
asked to drink water or other liquids just before the test and to avoid
urinating before or during the test. Usually women in the third trimester do not need to have a full bladder.
If you smoke, you will be
asked to stop smoking for 2 hours before the external monitoring test because
smoking decreases your baby's activity.
Talk to your doctor about any concerns you have regarding the need for the test, its
risks, how it will be done, or what the results may mean. To help you
understand the importance of this test, fill out the
medical test information form(What is a PDF document?).
How It Is Done
Most often, a biophysical profile (BPP)
is performed by your
obstetrician. But it may be done by an ultrasound
radiologist. A BPP can be done in your doctor's
office, hospital, or clinic.
Some doctors may use a modified biophysical
profile, which combines a nonstress test and measurements of the amniotic fluid
(amniotic fluid index).
External fetal heart monitoring
records your baby's heart rate while your baby is moving and not moving. It is
usually done just before a fetal ultrasound.
is done using two flat devices (sensors) held in place with elastic belts on
your belly. One sensor uses reflected sound waves (ultrasound) to keep track
of your baby's heart rate. The other sensor measures the duration of your
contractions. The sensors are connected to a machine that records the
information. Your baby's heartbeat may be heard as a beeping sound or printed
out on a chart.
If your baby moves or you have a contraction, you
may be asked to push a button on the machine. Your baby's heart rate is
recorded and compared to the record of movement or your contractions. This test
usually lasts about 30 minutes.
Often you do not need to remove
your clothes for the ultrasound test; you can lift your shirt and push down the
waistband of your skirt or pants. If you are wearing a dress, you will be given
a cloth or paper covering to use during the test.
You may need to have a full bladder. You may
be asked to drink 4 to 6 glasses of liquid, usually juice or water, about an
hour before the test. A full bladder helps transmit sound waves and pushes the
intestines out of the way of the uterus. This makes the ultrasound picture
You will not be able to urinate until the
test is over. But tell the ultrasound technologist if your bladder is so full
that you are in pain.
If an ultrasound is done during the later part of
pregnancy, a full bladder may not be needed. The growing fetus will push the
intestines out of the way.
You will lie on your back on a padded
examination table. If you become short of breath or lightheaded while lying on
your back, your upper body may be raised or you may be turned on your
A gel will be spread on your belly.
handheld instrument called a transducer will be pressed against the gel on your
skin and moved across your abdomen several times. You may watch the monitor to
see the picture of the fetus during the test.
When the test is finished, the gel is cleaned off of your
skin. You can urinate as soon as the test is done. Transabdominal ultrasound
takes about 30 to 60 minutes.
Ultrasound technologists are trained
to gather images of your fetus but can't tell you whether it looks normal or
not. Your health professional will share this information with you after the
ultrasound images have been reviewed by a radiologist or
How It Feels
Lying on your back (or side) during the
test may be uncomfortable. During a fetal ultrasound, you may have a feeling of
pressure in your bladder. The gel may feel cool when it is first applied to
your stomach. You will feel a light pressure from the transducer as it passes
over your abdomen.
There is very little chance of either the mother
or the baby having a problem from a biophysical profile (BPP). But you may feel
anxious if the ultrasound reveals a problem with your pregnancy or baby. A
nonstress test may falsely show distress in a baby that is actually
A biophysical profile (BPP) test measures
the health of your baby (fetus) during pregnancy. The results
are scores on five measurements in a 30-minute observation period.
A score of 8 to 10 points means that your baby is healthy. A score of 6
to 8 points means that you may need to be retested in 12 to 24 hours. A score
of 4 or less may mean the baby is having problems. Further testing will be
More tests, such
as a contraction stress test, may be recommended if your results are not
normal. For more information, see the topic
Contraction Stress Test.
If there is a
chance that you or your baby may have problems during your pregnancy, you may
have a biophysical profile test every week or twice a week during the last 12
weeks of your pregnancy. Your chances of having problems may be higher if you
A baby who seems small
for the length of the pregnancy or is not growing (intrauterine growth
retardation or restriction).
A biophysical profile may be done after an
injury, such as a car crash or fall. Your doctor may recommend more BPP
tests during the rest of your pregnancy.
Other Places To Get Help
American Congress of Obstetricians and Gynecologists
409 12th Street SW
P.O. Box 70620
Washington, DC 20024-9998
American Congress of Obstetricians and Gynecologists
(ACOG) is a nonprofit organization of professionals who provide health care for
women, including teens. The ACOG Resource Center publishes manuals and patient
education materials. The Web publications section of the site has patient
education pamphlets on many women's health topics, including reproductive
health, breast-feeding, violence, and quitting smoking.
How this information was developed to help you make better health decisions.