Translate This Page


Identification: Normal Flora/Contaminants

  • Even if the sampling procedure has been carried out meticulously, urine samples will often contain normal flora that will grow in the large section of the test.
  • The content of normal flora in urine samples is variable.
  • Normal flora consists primarily of coagulase-negative staphylococci (CNS). The normal flora will grow into small white colonies.

Photo 1.

Staphylococcus sp.= Normal flora.

Small white colonies present in the large section only: No bacterial UTI


Photo 2.

Small white colonies present as background in the large section.

A few red and blue colonies are also present (=contaminants): No bacterial UTI