Amniotic fluid index (AFI) from 14 to 20 weeks of gestation

Weeks of gestation	5^th percentile	10^th percentile	50^th percentile	90^th percentile	95^th percentile
14	2.8	3.1	5.0	8.0	8.6
15	3.2	3.6	5.4	8.2	9.1
16	3.6	4.1	5.8	8.5	9.6
17	4.1	4.0	6.3	9.0	10.3
18	4.6	5.1	6.8	9.7	11.1
19	5.1	5.6	7.4	10.4	12.0
20	5.5	6.1	8.0	11.3	12.9

These values are based on findings in singleton pregnancies with reliable gestational age assessment, no known fetal anomalies, and no medical or obstetric complications. At each gestational age, 50 patients were recruited, and only one examination was used per pregnancy.

Data from: Magann EF, Sanderson M, Martin JN, Chauhan S. The amniotic fluid index, single deepest pocket, and two-diameter pocket in normal human pregnancy. Am J Obstet Gynecol 2000; 182:1581.

Graphic 107646 Version 2.0

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Amniotic fluid index (AFI) from 14 to 20 weeks of gestation