MicrobiologyInfectious Disease

Urine For Culture And Sensitivity

Normal Range
No Growth (<10,000 CFU/mL)
Sample Type
Urine (Mid-stream)
Fasting
No
Unit
CFU/mL

Function

The Urine Culture and Sensitivity test is designed to identify specific bacteria or yeast causing a urinary tract infection (UTI) and to determine which antibiotics are most effective at inhibiting their growth. This 'Culture' identifies the organism, while 'Sensitivity' guides targeted therapy.

Why it is Ordered

This test is ordered when a patient exhibits symptoms of a UTI, such as painful urination (dysuria), frequent urination, urgency, or lower abdominal pain. It is also critical for:

  • Recurrent UTIs: To identify resistant strains.
  • Complicated Infections: Cases involving pregnancy, diabetes, or kidney stones.
  • Pyelonephritis: Suspected kidney infection indicated by flank pain and fever.
  • Post-Treatment: To ensure the eradication of a multidrug-resistant organism.

Associated Conditions

  • Cystitis: Infection of the bladder, commonly caused by E. coli.
  • Urethritis: Infection of the urethra.
  • Asymptomatic Bacteriuria: Presence of bacteria in urine without symptoms, critical to manage in pregnant women to prevent preterm labor.
  • Sepsis: If a UTI is left untreated, it can progress to a systemic bloodstream infection.

By matching the bacteria to the correct antibiotic, clinicians prevent the misuse of broad-spectrum drugs and reduce the risk of antibiotic resistance.

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

Contamination is the most common reason for a misleading urine culture. If the 'mid-stream clean catch' technique isn't followed perfectly, skin flora (like Lactobacillus or coagulase-negative Staph) can contaminate the sample. Additionally, if the patient has already started antibiotics before providing the sample, the culture may result in a 'false negative' despite an active infection.

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

Clinical References

Source-of-truth databases and clinical guidelines for Urine For Culture And Sensitivity:

Research & Guidelines

Related Indicators

Albert's Stain

View Range

Spore Stain

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AFB Culture (Radiometric)

View Range
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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