The Amniotic Fluid Index in Normal Pregnant Women

Abstract

Objective: To evaluate the values of amniotic fluid index (AFl) by weeks of gestation.
Main outcome measures: Mean, standard deviation, minimum and maximum values of
amniotic fluid index.

Results: Total of 830 transabdominal sonographic measurements for the amniotic
fluid index were performed. The mean ± standard deviation in centimetres were
10.9 t 2.2 (7.7-16.0) at 16 weeks'gestation and increased progressively to 16.1 t
3.7 (8.6-25.7) al25 weeks' gestation. Then the AFI gradually declined to 11.2 ± 3.3
(6.0-20.0) at 40 weeks' gestation.

Conclusion: The mean, standard deviation, minimum and maximum of AFI at each
gestational age of normal pregnancies were determined. This data might be useful
as a reference standard for AFI in Thai pregnant population.