Cystitis laboratory findings

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Steven C. Campbell, M.D., Ph.D.

Laboratory Findings

Urinalysis

• A urinalysis commonly reveals white blood cells (WBCs) or red blood cells (RBCs).
• Pyuria: >5-10 WBC/hpf or 27 WBC/microlitre
• Dipstick:
  • Nitrate reductase test: The nitrate reductase test is a test to differentiate between bacteria based on their ability or inability to reduce nitrate (NO₃) tonitrite (NO₂) using anaerobic respiration.
  • Leukocyte esterase: Leukocyte esterase (LE) is a urine test for the presence of white blood cells and other abnormalities associated with infection.

Urine Culture

• A urine culture (clean catch) or catheterized urine specimen may be performed to determine the type of bacteria in the urine and the appropriate antibiotic for treatment.
• Most patients with Urinary tract infection will have > 100,000 colonies of organism.