2. Uterine weight more than 280gm. the weight will be estimated sonographically using algebraic formula by Kung and Chang expressed in weights and measurements: weight(g)= 50+(4/3 x π(Pi) x L/2 x W/2 x AP/2) where (L) is the length of the uterus from the dome of the fundus to the level of the external os and (W) is the maximum width of the uterus at the level of the cornua and (AP) is the anteroposterior diameter of the uterus . Both (W) and (AP) will be taken perpendicular to the axis of the uterine length.