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Amniotic Fluid Index Values in Normal Pregnancy (Moore & Cayle)
AFI (mm) Percentile Values

 

Week 2.5th 5th 50th 95th 97.5th Number
16 73 79 121 185 201 32
17 77 83 127 194 211 26
18 80 87 133 202 220 17
19 83 90 137 207 225 14
20 86 93 141 212 230 25
21 88 95 143 214 233 14
22 89 97 145 216 235 14
23 90 98 146 218 237 14
24 90 98 147 219 238 23
25 89 97 147 221 240 12
26 89 97 147 223 242 11
27 85 95 146 226 245 17
28 86 94 146 228 249 25
29 84 92 145 231 254 12
30 82 90 145 234 258 17
31 79 88 144 238 263 26
32 77 86 144 242 269 25
33 74 83 143 245 274 30
34 72 81 142 248 278 31
35 70 79 140 249 279 27
36 68 77 138 249 279 39
37 66 75 135 244 275 36
38 65 73 132 239 269 27
39 64 72 127 226 255 12
40 63 71 123 214 240 64
41 63 70 116 194 216 162
42 63 69 110 175 192 30

Moore TR, Cayle JE. The amniotic fluid index in normal human pregnancy. Am J Obstet Gynecol 162:1168-73, 1990.

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Ultrasound Educational Press     Go Top
Peter W. Callen, M.D.
Professor of Radiology, Obstetrics, Gynecology and Reproductive Science
University of California Medical Center, San Francisco, California

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