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What is the amniotic fluid index?

The amniotic fluid index (AFI) is a test often performed weekly toward the end of pregnancy in women with high blood pressure, diabetes or other medical problems. It estimates the amount of amniotic fluid in the fetal sac to make sure there isn't too much (a condition called polyhydramnios) or too little (a condition called oligohydramnios). Both conditions may cause problems for mom and baby and can be a sign of other problems. If your health care provider suspects an abnormal fluid level, he or she may perform an AFI. During an AFI, an ultrasound machine is used to scan the uterus and measure the amniotic fluid around the baby. 

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.