Background: Antenatal testing is done to assess the health of the fetus and the likelihood of unfavorable consequences throughout pregnancy. Amniotic fluid is a crucial component of pregnancy that aids in the fetus's healthy growth, stimulates the development of its muscles and skeleton, and facilitates easier fetal movement. Objective: The aim of this study was to assess the perinatal outcomes in pregnant women having borderline amniotic fluid index (AFI). Patients and Methods: This prospective case control study was conducted on all pregnant women who were enrolled from patients attending Zagazig university hospitals and Al-Ahrar teaching hospital for antenatal care. Patients were divided into two groups: 1- Group A: included 42 patients with normal AFI (8-22cm). 2- Group B: included 42 patients with borderline AFI (5-8 cm). Results: There was highly statistically significant difference between two groups regarding Amniotic fluid index and the baby weight. Also, this study showed statistically significant difference between two groups regarding NICU. Regarding the correlations of AFI, there was highly statistically significant difference between amniotic fluid index and Gestational age (Week), Also, there were highly statistically significant differences between Amniotic fluid index and LIQUOR, and fetal distress syndrome. Conclusion: It could be concluded that adverse perinatal outcome is seen in higher percentage of patients having oligohydramnios than that of borderline AFI.