How are urinary tract infections (UTIs) diagnosed during pregnancy?

Updated: Aug 17, 2021
  • Author: Raisa O Platte, MD, PhD; Chief Editor: Edward David Kim, MD, FACS  more...
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Two consecutive voided specimens with isolation of the same bacterial strain, at a colony count of 100,000 colony-forming units (CFUs) per milliliter or higher, has historically been used to define a positive culture result. A single catheterized specimen yielding a colony count of at least 100 CFU/mL is also diagnostic. [5] Counts lower than 100,000 CFU/mL, with 2 or more organisms, usually indicate specimen contamination rather than infection. Patients with pyelonephritis often have white blood cell (WBC) casts.

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