الفهرس 
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Abstract
Summary
Gestational age (GA) refers to the length of pregnancy after the first day of the last menstrual period (LMP) and is usually expressed in weeks and days. This is also known as menstrual age (Papageorghiou et al., 2016).
The 3 basic methods used to help estimate gestational age (GA) are menstrual history, clinical examination, and ultrasonography, the first 2 are subject to considerable error and should only be used when ultrasonography facilities are not available (Iram et al., 2018).
Prediction of gestational age (GA) based on sonographic fetal parameters is perhaps the cornerstone in modern obstetrics and continues to remain an important component in the management of pregnancies with fetuses who have growth disturbances (Kumar et al., 2015).
Thisprospective observational study was conducted in Obstetrics and Gynecology Outpatient Clinic at Beni-Suef University Hospital from the period from September 2021- June 2022 on 100 Outpatients attending Beni-Suef University Hospital pregnant women in second or third trimester pregnancy.
A multiple regression was run to predict gestational age from Biparietal diameter.
Femur length, Trans cerebellar diameter, and Kidney length. These variables statistically significantly predicted the gestational age, F(5, 64) = 209, P-value < 0.05, R2 = 0.935. All four variables added statistically significantly to the prediction, P-value <0.05.
To stop on the real role of the studied parameters we stratified the studied women to 2nd and 3rd trimesters, there were 50% in the 2nd trimester and 50% in the 3rd trimester.
A multiple regression was run to predict gestational age from Biparietal diameter,
Femur length, Trans cerebellar diameter, and Kidney length. These variables statistically significantly predicted the gestational age in the 2nd trimester except for the kidney length. On the other hand, the same variables can’t except the trans cerebellar diameter and kidney length were the only predictors when the other parameters are constant.
In conclusion, The TCD and KL both rise with an increase in GA and have excellent correlation coefficients, indicating good measurement agreement and reproducibility that is unaffected by the late-trimester variability. According to the findings of this research, KL and TCD exhibit a strong correlation with fetal GA in the third trimester , while in the second trimester BPD, FL, AC and TCD are good predictors of gestational age and no role for KL at that time of pregnancy