MicrobiologyInfectious Disease

Urine for Culture & Sensitivity

Normal Range
No growth at 24-48 hours
Sample Type
Urine (Mid-stream)
Fasting
No
Unit
CFU/mL

Function

The Urine Culture and Sensitivity (C&S) test is the gold standard for diagnosing Urinary Tract Infections (UTIs). Its primary function is to identify specific pathogenic bacteria or yeast growing in the urinary tract and determine which antibiotics are most effective at inhibiting their growth. This two-step process ensures that treatment is targeted and effective, reducing the risk of antibiotic resistance.

Why it is Ordered

Physicians order this test when a patient presents with symptoms suggestive of a UTI, such as:

  • Burning sensation during urination (dysuria).
  • Frequent or urgent need to urinate.
  • Cloudy, dark, or strong-smelling urine.
  • Lower abdominal pain or pelvic pressure.
  • Persistent fever or chills (suggesting a potential kidney infection).

Associated Conditions

  • Cystitis: Infection of the bladder, the most common form of UTI.
  • Pyelonephritis: A more serious infection that has reached the kidneys.
  • Urethritis: Infection of the urethra, often associated with sexually transmitted infections.
  • Asymptomatic Bacteriuria: The presence of bacteria in the urine without symptoms, which is clinically significant in pregnant women or patients undergoing urological surgery.
  • Recurrent UTIs: Identification of specific strains helps in managing chronic infection patterns.

Check Your Result

Check Your Result

Interactive
CFU/mL

Enter your lab result to see where you stand compared to the standard reference range.

Why Context Matters

Results can be significantly confounded by improper collection techniques. If the 'mid-stream' protocol is not followed, skin flora (commensal bacteria) can contaminate the sample, leading to a false-positive result. Furthermore, recent antibiotic use prior to the test can suppress bacterial growth, resulting in a false negative. High fluid intake immediately before collection may dilute the urine to the point that bacterial counts fall below the detection threshold of 10^5 CFU/mL.

Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.

Related Indicators

DR

Medically Reviewed by Dr. Binoy Babu, MBBS

Board Certified Doctor • 10+ Years Clinical Experience

Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.

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