Background:It is indeed possible to estimate fetal age by combining measurements of various fetal bones such as the femur, humerus, tibia, and ulna. The objective of this study was to evaluate the diagnostic accuracy of using sonographic measurements of fetal humeral length as a means to estimate gestational age. This approach can provide valuable information for tracking the development and growth of the fetus during pregnancy. Methods: The study involved the analysis of ultrasound data from 240 healthy pregnancies. A 3.5MHz probe and standard obstetric practices were employed to assess the biometrics of the fetal skeleton. Specifically, the length of the fetal humerus was determined by measuring its diaphyseal apophysis, which involves assessing the length from the apex to the apophysis of the bone. This method allowed for the collection of data on fetal skeletal development, which can be instrumental in estimating gestational age and monitoring the health and growth of the fetus during pregnancy. Results: In the current study, a total of 240 pregnant females were included. Among them, 44.33% were nulliparous, meaning they were experiencing their first pregnancy, while 55.66% were multiparous, indicating they had previous pregnancies.The study examined the mean humerus length in relation to the Period of Gestation (POG) calculated by the Last Menstrual Period (LMP). These results provide insights into how fetal humerus length varies throughout pregnancy, which can be useful for estimating gestational age and monitoring fetaldevelopment. Conclusion: Based on the findings of the present study, it is suggested that the length of the fetal humerus can serve as a reliable indicator of gestational age. This measurement can be a valuable tool for healthcare providers in estimating the stage of pregnancy and monitoring fetal development, ultimately contributing to better prenatal care and management.