Criteria for the presumptive diagnosis of urinary tract infection

• Symptoms of bladder irritation (dysuria, urgency or frequency of urination) or of infection of the kidney (flank pain, fever, costovertebral angle tenderness).
• Urine sediment containing 8 to 10 or more white blood cells per high-powered field
• Quantitative urine culture revealing at least 100,000 microorganisms per milliliter of urine in a clean-voided specimen
  • It is possible to have a bacterial urinary tract infection with a negative urinalysis and/or bacterial counts in the urine of less than 10⁵
  • The presence of 100,000 microorganisms per milliliter of urine in a patient without symptoms is termed "asymptomatic bacteriuria."
• Consistent sterile cultures can be used to rule out bacterial infection of the urinary tract as a cause of symptoms, and make one look to other diagnoses

References

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