Background: The newborns with deficiency of vitamin K will be at high risk of haemorrhagic syndrome. Various risk factors from mother and child have been investigated by a number of authors previously. In order to contribute towards preventing haemorrhage effectively, studying various related factors to decreased prothrombin level were required. Objective: To study the rate of prothrombin deficiency in newborns at the National Institute of Obstetrics and Gynecology to discover the factors related to prothrombin levels; to prevent haemorrhaging. Subject and methods: A cross-sectional study was conducted in 449 newborns, born at the National Institute of Obstetrics and Gynecology. Results and Conclusion: The rate of prothrombin related to gestation age, birth weight, Apgar index during birth and with or without artificial help. Antibiotic usage of the mothers affected the prothrombin level of newborns. The lower prothrombin level in premature newborns with low birth weight, receiving artificial help, Apgar index \u22647 marks. Early identification of risk factors of decreased prothrombin level contribute towards the effective prevention of haemorrhage in newborns was required.
prothrombin ; haemorrhage