My urine culture shows E. coli resistant to many drugs, including ciprofloxacin and levofloxacin. However, in a different, well established lab (operating since 1965), the same test done three times shows the bacteria are susceptible to these drugs. Which lab results should I trust? How is it possible to get two different results for the same bacteria? The prior lab used automated sensitivity testing, while the other lab reports in vitro DST results

Answered by 1 Apollo Doctors

Dr Yusuf Mohammad

General Practitioner

MBBS
Advanced Certificate Course in Dermatology
8+ Yrs

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Different labs use different methods, cut offs. Automated may detect low resistance. Follow report from trusted lab. Repeat Urine Culture (same lab) if unsure. Consult doctor before antibiotic change.

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Answered 12/09/2025

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