Confirmed: Urine is not sterile | Fox News.
Hilt said, when a screening method for kidney infections was developed. It was a simple and easy test that was soon applied to bladder infections, too.
But the test involved culturing only a small amount of urine in open air, at a temperature of 95 degrees Fahrenheit (35 degrees Celsius) for 24 hours. Not all bacteria grow in those conditions.
