AMNIOTIC FLUID INDEX VALUES (mm) IN NORMAL PREGNANCY

 

Amniotic Fluid Index Percentile Values

Week

2.5th

5th

50th

 

95th

97.5th

16

73

79

121

 

185

201

17

77

83

127

 

194

211

18

80

87

133

 

202

220

19

83

90

137

 

207

225

20

86

93

141

 

212

230

21

88

95

143

 

214

233

22

89

97

145

 

216

235

23

90

98

146

 

218

237

24

90

98

147

 

219

238

25

89

97

147

 

221

240

26

89

97

147

 

223

242

27

85

95

146

 

226

245

28

86

94

146

 

228

249

29

84

92

145

 

231

254

30

82

90

145

 

234

258

31

79

88

144

 

238

263

32

77

86

144

 

242

269

33

74

83

143

 

245

274

34

72

81

142

 

248

278

35

70

79

140

 

249

279

36

68

77

138

 

249

279

37

66

75

135

 

244

275

38

65

73

132

 

239

269

39

64

72

127

 

226

255

40

63

71

123

 

214

240

41

63

70

116

 

194

216

42

63

69

110

 

175

192

Modified from Moore TR, Cayle JE: The amniotic fluid index in normal human pregnancy. Am J Obstet Gynecol1990; 162: 1168-1173.

 

*Normal AFV in the 2nd half of pregnancy implies at least one functioning fetal kidney.