For educational and reference use only. These calculators do not replace clinical judgement, local protocols, or a qualified clinician. Verify every result independently before it informs patient care.
Women's & obstetric imaging
Amniotic Fluid Index (AFI)
Amniotic fluid index: the sum of the deepest vertical amniotic-fluid pocket in each of the four abdominal quadrants (cm).
Result
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Enter all values to calculate.
Formula
AFI = Σ deepest vertical pocket in each of the 4 quadrants (cm). Oligohydramnios ≤5 cm; polyhydramnios ≥24 cm.
References
- Phelan JP, Ahn MO, Smith CV, et al. Amniotic fluid index measurements during pregnancy. J Reprod Med 1987;32(8):601–604 (lowest group 0–5.0 cm).
- Moore TR, Cayle JE. The amniotic fluid index in normal human pregnancy. Am J Obstet Gynecol 1990;162:1168–1173.
Disclaimer
Thresholds vary (some use single-deepest-pocket instead). AFI has limited accuracy for true fluid volume; interpret alongside the clinical picture and gestational age.
For educational and reference use only. These calculators do not replace clinical judgement, local protocols, or a qualified clinician. Verify every result independently before it informs patient care.
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