Biophysical Profile (BPP) During a Twin Pregnancy
As your twin pregnancy progresses, your healthcare provider may recommend additional testing to make sure both babies are healthy and thriving.
One of the most common tests is a Biophysical Profile (BPP).
If you've never had one before, hearing the name can sound intimidating. The good news is that a BPP is a painless, noninvasive way for your healthcare team to monitor your babies' well-being before birth.
Here's what happens during a Biophysical Profile and why it plays such an important role in many twin pregnancies.
What Is a Biophysical Profile (BPP)?
A Biophysical Profile (BPP) is a prenatal test that uses ultrasound to evaluate your babies' well-being before birth. In many cases, it is also combined with a Nonstress Test (NST) to provide additional information about fetal health.
Together, these tests help your healthcare team determine whether your babies appear to be receiving enough oxygen and thriving inside the womb.
Because twin pregnancies have a higher risk of complications than singleton pregnancies, BPPs are commonly performed during the third trimester or whenever closer monitoring is needed.
Why Would I Need a BPP?
Your provider may recommend a BPP for several reasons, including:
A twin pregnancy requiring additional monitoring
High blood pressure or preeclampsia
Gestational diabetes
Fetal Growth Restriction (FGR)
Decreased fetal movement
Concerns about amniotic fluid levels
Pregnancy continuing beyond the expected delivery timeframe
Abnormal findings on another prenatal test
Some providers perform BPPs routinely during the third trimester for twins, while others order them only if there is a medical reason.
What Does a BPP Measure?
During the ultrasound, your provider evaluates five signs of fetal well-being.
1. Fetal Breathing Movements
Although babies do not breathe air before birth, they practice breathing by moving their diaphragm and chest muscles.
Seeing these practice breathing movements is a reassuring sign.
2. Body Movements
The sonographer watches for normal movements such as stretching, kicking, rolling, or moving the arms and legs.
Healthy babies are generally active during the exam. However, perfectly healthy babies are sometimes asleep during part of the test, so your provider may simply wait a little longer for them to wake up.
3. Muscle Tone
Muscle tone refers to movements such as opening and closing a hand or bending and straightening the arms or legs.
Strong muscle tone is another reassuring sign of fetal well-being.
4. Amniotic Fluid
Your provider measures the amount of amniotic fluid surrounding each baby.
Normal fluid levels suggest the placenta is functioning well and that each baby is receiving adequate support inside the uterus.
5. Nonstress Test (NST), When Included
Some BPPs also include a Nonstress Test (NST), which measures each baby's heart rate while looking for normal increases that occur with movement.
If an NST is part of your evaluation, it provides additional information about your babies' well-being.
How Is a BPP Scored?
Each ultrasound component receives either:
2 points if it meets normal criteria
0 points if it is not observed or does not meet the expected criteria
Each baby is scored individually.
If an NST is included, it is also scored and added to the total.
A normal score is typically:
8 out of 8 for the ultrasound portion alone
8 to 10 out of 10 when an NST is included
If a score is lower than expected, it does not automatically mean something is wrong. Sometimes babies are simply sleeping during the test.
Your provider may repeat the BPP, perform an NST, or recommend additional monitoring depending on the results and your overall pregnancy.
How Long Does a BPP Take?
Most Biophysical Profiles take 30 to 60 minutes.
Because twins require separate evaluations for each baby, your appointment may take longer than it would during a singleton pregnancy.
If one or both babies are sleeping, the sonographer may spend extra time waiting for movements or ask you to change positions before finishing the exam.
Do I Need to Prepare?
Most BPPs require very little preparation.
Your provider may recommend:
Eating a normal meal before your appointment
Staying well hydrated
Wearing comfortable clothing
Allowing extra time in case the exam takes longer than expected
Follow any specific instructions provided by your healthcare team.
What Happens if My BPP Isn't Normal?
An abnormal BPP does not always mean your babies are in danger.
Sometimes:
One baby is asleep.
The ultrasound could not capture enough movement.
Additional monitoring is needed to gather more information.
Depending on the results, your provider may recommend:
Repeating the BPP
A Nonstress Test (NST)
Doppler ultrasound studies
Additional ultrasounds
More frequent monitoring
Delivery, if continuing the pregnancy is no longer the safest option
Your healthcare team considers your gestational age, medical history, and the overall clinical picture before making recommendations.
Is a BPP Safe?
Yes.
A Biophysical Profile is a noninvasive test that uses ultrasound, and in many cases external fetal heart rate monitoring.
It does not expose you or your babies to radiation and is considered safe when performed for medical purposes.
My RN and Twin Mom Perspective
As an RN, I appreciate that a Biophysical Profile gives providers several ways to assess how babies are doing before birth instead of relying on a single measurement.
As a twin mom, I remember feeling relieved every time I left an appointment after hearing that both babies looked great. Waiting for the sonographer to finish all the measurements sometimes felt endless, but those extra minutes gave me peace of mind knowing my babies were being monitored so carefully.
If your appointment takes longer than expected, try not to panic. Often, the sonographer is simply waiting for one baby to stretch, practice breathing, or wake up from a nap.
💛 Twin Mom Tip
Bring a small snack and a bottle of water to your appointment.
Healthy babies are sometimes asleep during a BPP. If your provider asks you to change positions, take a short walk, or have a snack, it is often just to encourage your babies to wake up so the sonographer can finish the exam.
Frequently Asked Questions
Is a BPP the same as an NST?
No.
A Nonstress Test (NST) only monitors your babies' heart rates.
A Biophysical Profile uses ultrasound to evaluate movement, muscle tone, breathing movements, and amniotic fluid. Some BPPs also include an NST for additional information.
Will I have a BPP at every appointment?
Not usually.
Some twin pregnancies include regular BPPs during the third trimester, while others only require them if additional monitoring is needed.
Can my babies fail a BPP?
No.
A lower score does not mean a baby has "failed."
It simply means your provider may want additional information or closer monitoring before making any decisions.
What if one twin scores differently than the other?
Each baby is evaluated individually.
If one twin has a lower score, your provider will consider many factors before deciding whether additional testing or treatment is needed.
Does a BPP hurt?
No.
The ultrasound and, if performed, the fetal monitors are painless, although the sonographer may occasionally press on your abdomen to obtain better images.
Related Guides
Nonstress Test (NST): What to Expect During a Twin Pregnancy
Twin Pregnancy Growth Scans: What to Expect at Every Ultrasound
Doppler Ultrasounds During a Twin Pregnancy
Twin Pregnancy Ultrasounds: What to Expect Throughout Your Pregnancy
Twin Pregnancy Terms Explained: The Complete A to Z Glossary
What Is a Maternal-Fetal Medicine (MFM) Doctor?
References
American College of Obstetricians and Gynecologists (ACOG). Special Tests for Monitoring Fetal Well-Being.
Society for Maternal-Fetal Medicine (SMFM). Patient education resources on antenatal fetal surveillance and high-risk pregnancy.
International Society of Ultrasound in Obstetrics and Gynecology (ISUOG). Practice guidelines for ultrasound assessment in pregnancy.
American Institute of Ultrasound in Medicine (AIUM). Practice parameters for obstetric ultrasound.
Medical Disclaimer
This article is for educational purposes only and should not replace medical advice from your healthcare provider. Always consult your OB, maternal-fetal medicine specialist, or another qualified healthcare professional with questions about your pregnancy, test results, or any concerning symptoms.
