Significant bacteriuria among requested repeat urine samples and its clinical correlation

Area of Science:

• Microbiology
• Clinical Pathology
• Infectious Diseases

Background:

• Urinary tract infections (UTIs) are common bacterial infections.
• Routine urine cultures are essential for diagnosis and antibiotic sensitivity testing.

Purpose of the Study:

• To evaluate the significance of repeat urine samples after initial cultures show mixed growth (≥3 colonies).
• To determine the microbiological profile, contamination rates, and antibiotic sensitivity patterns in repeat urine samples.

Main Methods:

• Retrospective analysis of 617 requested repeat urine samples.
• Samples were collected with aseptic precautions after primary cultures yielded ≥3 colony types.
• Microbiological profile and clinical correlation were analyzed.

Main Results:

• Significant bacteriuria was found in 47.3% of repeat samples.
• Escherichia coli was the most common isolate (28%), followed by Klebsiella and Enterococcus species.
• 45.6% of Gram-negative bacilli were Multi-Drug Resistant (MDR), and Vancomycin-Resistant Enterococcus (VRE) was also detected.

Conclusions:

• Requesting repeat urine samples is justified for accurate microbiological reporting.
• This practice helps prevent reporting of contaminants and guides evidence-based antibiotic therapy.