Background Amniotic fluid is a transparent, somewhat yellow liquid that envelops the foetus during pregnancy. It is enclosed within the amniotic sac. The fluid has a slightly alkaline pH, a low specific gravity of 1.010 and an osmolarity of 250 mosmol/litre, indicating foetal maturity. The amniotic fluid shields the foetus from damage, regulates body temperature, and possesses bacteriostatic properties. Aim The aim is to study the importance of amniotic fluid index in post-dated pregnancies and to know its various associated maternal and perinatal outcomes. Objectives 1. To evaluate the role of AFI in post-dated pregnancy. 2. To assess the effect of AFI on maternal outcome in postdated pregnancy. 3. To asses the effect of AFI on perinatal outcome in postdated pregnancy. Methods The current Prospective study was conducted in the Department of Obstetrics and Gynaecology, Government General Hospital, Anantapuram, Andhra Pradesh for a period of 18 months on 200 patients. Results This study enables the prediction of perinatal outcomes through the assessment of Amniotic Fluid Index (AFI) via ultrasonography, a straightforward, noninvasive bedside procedure conducted for all antenatal patients to identify those at risk who require enhanced intrapartum monitoring. The assessment of Amniotic Fluid Index (AFI) should be utilized in conjunction with additional fetal monitoring techniques. Through appropriate assessment in the early third trimester, we can effectively identify patients requiring additional care and early termination, thus reducing the incidence of postdated pregnancy admissions and unnecessary cesarean sections. Conclusion In conclusion, the research highlights AFI as a critical component of prenatal care, with significant impacts on both maternal and neonatal health outcomes. Consistent AFI evaluations and suitable therapeutic interventions are crucial to reduce risks and impr ove perinatal results.

Amniotic Fluid Index , post dated pregnancy, maternal outcome ,perinatal outcome, NICU admission.