Antenatal Testing

Antenatal Testing

Regular nonstress tests (NSTs) and amniotic fluid index (AFI) assessments help us monitor your baby's health.

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Antenatal testing at UCSF Health

Antenatal testing, also called prenatal testing, assesses your health and the health of your developing baby. The test results help your provider monitor your baby's well-being and may guide your prenatal care.

Your provider may recommend certain tests if you have:

  • Diabetes

  • High blood pressure

  • Overdue pregnancy

  • Advanced maternal age (35 or older)

Most patients repeat the tests once or twice a week. The tests are noninvasive, safe and comfortable.

Antenatal testing services

Our specially trained registered nurses perform antenatal tests using a fetal monitor and an ultrasound. We provide nonstress tests (NSTs) and amniotic fluid index (AFI) assessments.

If your provider needs more information, we perform a biophysical profile (BPP).

Nonstress test (NST)

We assess your baby's well-being by observing their heart rate in response to movement. During the test, we strap two small monitors to the outside of your belly. The monitors record contractions and your baby's heart rate.

Your nurse explains the test before you start and answers questions you may have.

Amniotic fluid index (AFI)

We use an ultrasound machine to look at your uterus and determine if there is enough amniotic fluid surrounding your baby. Too much or too little fluid can be a sign that your baby may need special care.

During the tests, you can see your baby on the ultrasound screen. Your nurse reviews the test results with you.

Biophysical profile (BPP)

Your provider may request a BPP if they need more information. The BPP combines an NST and AFI into a five-part test that uses the fetal monitor and ultrasound to evaluate:

  • Amniotic fluid volume

  • Body movements

  • Breathing movements

  • Heart rate response to movement

  • Muscle tone

After the BPP, your nurse scores the test and explains the results to you. You will discuss whether additional testing or evaluation is needed.

Recognized excellence

UCSF Health is a top-performing hospital for maternity care.
  • Maternal Care badge logo with a stylized depiction of a mother and baby in a circle with a laurel branch

    Rated high-performing for maternity care – uncomplicated pregnancy by U.S. News & World Report

  • One of the nation’s best for obstetrics & gynecology

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