Background &Method: To evaluate the maternal outcomes through ABG index and its influence on new-borns through Apgar scoring. Role of arterial blood gas values and their implications to patient management.A total of 130 women with PIH syndrome were treated in Department of Obstetrics and Gynaecology of IMCHRC, Indore, over a period of 12 months Result:In this study, 66.10% PIH patients improved by conservative management, whereas 33.88% required ventilatory support of which 5.08% died on mechanical ventilation. Amongst which maximum patients which succumbed showed decompensated metabolic acidosis at 0 hr ABG.In this study, the mean pH value, PO2, HCO3 in severe PIH cases were lower than the mild PIH cases, whereas the mean PCO2 and BE levels in severe PIH cases were higher than the mild PIH cases. Therefore, with the exerbation of the disease,the differences of indexes from normal values became larger. Conclusion:It has been observed that PIH cases with lower pH, pO2 and bicarbonate and higher lactate, pCO2 and BE at presentation are to be considered as high risk patients (metaboic acidosis) and should be monitored intensively to avoid maternal and perinatal mortality. Moreover, there was a positive correlation between arterial blood pH of PIH patients and neonate's Apgar score at 1 min after birth. With the decline in the pH value, the neonate's Apgar score became lower and the risk of asphyxia increased.With the exacerbation of the maternal disease in the study, the differences of indexes from normal values became larger also the incidence rate of neonatal asphyxia became higher. Therefore, Regular monitoring of ABG parameters can provide early warning of deterioration and one can judge the effectiveness of therapeutic intervention, combined with neonatal Apgar score which could make countermeasures against neonatal asphyxia during delivery in advance, help monitoring and intervention of infants to be born, thus can predict the outcome, prognosis and duration of hospital stay and improve the fertility quality.