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Amniotic fluid index

Dr Abhilash Sandhyala and Dr Yuranga Weerakkody et al.

The amniotic fluid index (AFI) is an estimate of the amniotic fluid volume in a fetus. It is measured by adding the values of individual amniotic pocket depths (in cm's) for each of the four quadrants. It is part of the fetal biophysical profile.

The normal range for amniotic fluid volumes varies with gestational age. As a rule of thumb :

an AFI of < 8 implies oligohydramnios
an AFI of > 25 implies polyhydramnios

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