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Abstract
Amniotic fluid (AF) is of fetal origin with some maternal contribution via the extra placental membranes. Many studies have proved that, the amniotic fluid is not a static reservoir but rather a dynamic system in which there is continuous interchange between the amniotic sac and feto-maternal circulation.
The aim of the present study is to assess the accuracy of different clinical and sonographic parameters in the diagnosis of oligohydramnios at full term.
In the present study forty pregnant women were selected, thirty pregnant women at maternal age (20 – 35 years), Gestational age at full term (37- 41 weeks), and intact membranes, there are clinical suspicion of oligohydramnios and ultrasound examination reveals that the single deepest pocket of amniotic fluid is < 2 cm. After 24 hours of the diagnosis of oligohydramnios, the women were subjected to elective cesarean section during which the amniotic fluid was collected and its amount was estimated. Ten normal pregnant women at full term with normal amniotic fluid volume (the single deepest pocket > 2 cm) who are scheduled for elective cesarean section, the amniotic fluid was collected and its volume is estimated.
The results showed that the mean of the SDP was 1.62 cm ranging between (0.9 – 2.0 cm), the mean of AFI was 4.37 cm ranging between (1.5 – 7.5 cm) and the mean of the actual amount of amniotic fluid was 79.8 cc (range 15 – 110). It can be concluded that sonographic measurements of the SDP and the AFI have positive correlations with the measured actual amniotic fluid volumes. For evaluating the accuracy of the AFI in relation to the SDP, it was found that the sensitivity was 73.3% and the specificity was 90%.