AFI <5 cm is considered to be oligohydramnios. Typical values include: AFI between 5-25 cm is considered normal median AFI level is 14 cm from week 20 to week 35, after which the amniotic fluid volume begins to reduce. A measurement of 2 cm is classified as oligohydramnios, 2-8 cm as normal, and > 8 cm as hydramnios, the same measurement. The study aimed to identify normal value of amniotic fluid volume in pregnant women in second and third trimester to correlate gestation age and maternal age. The normal range for amniotic fluid volumes varies with gestational age. Gestational age-specific values of amniotic fluid index should be used, and the 5th and 95th percentiles serve as the lower and upper limits, respectively, of normal. In the estimation of amniotic fluid volume using the SDP in twins, the separating membrane is located and the largest vertical pocket of amniotic fluid volume in each sac is measured in centimetres ( Figure 8 ). This can occur due to gastrointestinal malformations, fetal neurologic problems such as anencephaly, or mechanical obstruction of the esophagus by. If the fetus is unable to swallow the typical amounts of amniotic fluid, this can lead to polyhydramnios. The difference between the median amniotic fluid index for the total group and the medians for the preterm and term patients was also significant (P <. The normal fetus is constantly swallowing amniotic fluid and urinating to create more fluid. The difference between the median index for preterm patients (11.9 cm) and that for the term group (10.8 cm) was found to be statistically significant (P <. The index then gradually declined to a median of 9.1 cm (range, 4.8-14.2) by 40 weeks' gestation. From a median of 10.3 cm (range, 8.7-13.7, 5th-95th percentile) at 15 weeks' gestation, the amniotic fluid index rose progressively to a maximum median of 14.0 cm (range, 4.0-18.6) at 30 weeks. The results were stratified by week of gestation. From 705 published amniotic volumes for normal pregnancies, we found that after log transformation, amniotic fluid volume had a uniform variability over 8 to 43 weeks gestation. The amniotic fluid index was measured prospectively in 892 patients with a normal singleton pregnancy between 15 and 40 weeks and an estimated fetal weight between the 10th and 90th percentile. The purpose of this study was to provide a quantitative characterization of the changes in amniotic fluid volume that occur throughout gestation. The purpose of this study was to define the values of the amniotic fluid index for normal pregnancy by week of gestation in our population. Amniotic fluid volume is an important parameter in the assessment of fetal well-being.
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