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/microliter
- 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.