Cerebroplacental ratio (CPR) is an important indicator for predicting adverse outcomes during pregnancy. It is derived from the division of the PI Doppler index from the middle cerebral artery (MCA) into the umbilical cord vessels. Objectives: To characterize the relationship between CPR and some factors such as diabetes, gestational hypertension, body mass index (BMI), PAPP-A, and drug use. Methods: This descriptive-analytic study was conducted in Ahvaz in 2016. In this study, the CPR was

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... ated in 230 pregnant women who were at 28 -38 weeks of gestational age, except for pregnant women with severe Small for gestational age (SGA) and multiple pregnancies. In this study, a number of factors such as diabetes mellitus, gestational hypertension, BMI, PAPP-A, and drug use were investigated. Data were analyzed using SPSS software, version 19. Results: In this study, there is a relationship between CPR and diabetes mellitus, gestational hypertension, and maternal drug use. There is not a relationship between CPR and BMI and PAPP-A. Conclusions: Diabetes and gestational hypertension are two factors that influence the cerebroplacental ratio.