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Adds the deepest vertical fluid pocket from each of the four uterine quadrants to give the amniotic fluid index.
Amniotic fluid index
AFI = sum of the deepest vertical pocket in each of four quadrants; oligohydramnios under 5 cm, normal 8-24 cm, polyhydramnios over 24 cm
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
Yes for diagnosing oligohydramnios: using AFI leads to more interventions without improving outcomes, so many units prefer the single pocket measure.
Under 2 cm defines oligohydramnios and over 8 cm suggests polyhydramnios.