Microbiology All India exam 3ea6de58 Diagonal conjugate is defined as the distance between A Upper border of symphysis pubis and the sacral promontory B Lower border of symphysis pubis and the sacral promontory C Lower border of symphysis pubis and the third piece of sacrum D Lower border of symphysis pubis and tip of sacrum High-Yield Explanation The diagonal conjugate is clinically estimated by measuring the distance from the sacral promontory to the lower margin of the symphysis pubis.