A post-ejaculation urinalysis or PEU is a test performed to check the presence of sperm in the urine, which is caused by a condition called retrograde ejaculation. In retrograde ejaculation, the semen flows back to the bladder instead of flowing out through the urinary meatus at the moment of ejaculation.
Ejaculation is the ejection of semen out of the urethra. Under normal circumstances, ejaculation propels semen forward through a man’s urethra and out the tip of his penis. This is caused by the contraction of the sphincter at the entrance to the bladder. However, retrograde ejaculation refers to the condition wherein the semen travels backwards into the bladder because of the dysfunction of the sphincter mentioned above.