Which urinalysis results suggest urinary tract infection (UTI) during pregnancy?

Updated: Aug 17, 2021
  • Author: Raisa O Platte, MD, PhD; Chief Editor: Edward David Kim, MD, FACS  more...
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Positive results for nitrites, leukocyte esterase, WBCs, red blood cells (RBCs), and protein suggest UTI. Bacteria found in the specimen can help with the diagnosis.

Urinalysis has a specificity of 97-100%, but it has a sensitivity of only 25-67% when compared with culture in the diagnosis of asymptomatic bacteriuria.

Millar and Cox indicate that 1-2 bacteria in an unspun catheterized specimen or more than 20 bacteria per high-power field (HPF) in spun urine correlate closely with bacterial colony counts higher than 100,000 CFU/mL on a urine culture. [23]

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