Doppler fluximetry in obstetrics refers to the use of Doppler ultrasound technology to assess blood flow patterns and velocities in the maternal and fetal circulations during pregnancy. It provides valuable information about the vascular dynamics in the placenta, umbilical cord, and fetal organs, aiding in the evaluation of fetal well-being and the identification of potential complications. The umbilical artery, middle cerebral artery, and uterine artery are the blood vessels used in Doppler fluximetry to measure blood flow patterns and velocities. The parameters commonly assessed in Doppler fluximetry include: Systolic/Diastolic Ratios: The ratio of peak systolic velocity to end-diastolic velocity, providing information about the resistance to blood flow. Pulsatility Index (PI): Calculated as the difference between peak systolic and end-diastolic velocities divided by the mean velocity, reflecting the resistance and compliance of the vessel. Resistance Index (RI): Calculated as the difference between peak systolic and end-diastolic velocities divided by the peak systolic velocity, assessing vascular resistance. By evaluating these parameters, Doppler fluximetry can provide insights into the uteroplacental and fetal circulations. Abnormal findings, such as increased resistance or altered blood flow patterns, may indicate placental insufficiency, fetal growth restriction, fetal anemia, or other complications. These findings can guide clinical management and help in making decisions regarding the timing and mode of delivery or further interventions. It’s essential to note that the interpretation of Doppler findings should always be done in conjunction with other clinical data, such as fetal growth assessment, maternal health, and fetal well-being. Doppler flowmetry should always be performed and interpreted by qualified healthcare professionals, such as obstetricians, perinatologists, or sonographers, who can integrate the Doppler findings with other clinical data to provide appropriate care for pregnant women.