A Urine test is conducted to find the presence of bacterias in it that might cause some form of infection. Some of the bacterias that are generally tested in the Urine are - Proteus, Klebsiella, Enterobacter, Staphylococcus, Acinetobacter. However, the most common bacteria of them all that cause most of the UTI is the Escherichia coli or E.coli bacteria.