How do I interpret this lab result? I have a UTI and the MIC sensitivity test for Bactrim came back as “<=20, Susceptible”. The package insert says the MIC breakpoint for Bactrim is <=2/38 for this type of bacteria. Will Bactrim work?

  if Bactrim will work for your UTI, I can help you understand your lab results and provide some general information on interpreting MIC (minimum inhibitory concentration) tests.


Understanding your lab results:

  • <=20, Susceptible: This means that the bacteria causing your UTI are inhibited by Bactrim at a concentration of 20 micrograms per milliliter or less.
  • MIC breakpoint for Bactrim is <=2/38: This refers to the standard used to interpret the MIC test for this specific type of bacteria and Bactrim. It means that if the MIC is less than or equal to 2 micrograms of sulfamethoxazole and 38 micrograms of trimethoprim per milliliter combined, the bacteria are considered susceptible to Bactrim.

Interpreting the information:

  • Your MIC (<=20) falls within the susceptible range indicated by the breakpoint (<=2/38). This suggests that Bactrim is likely to be effective against the bacteria causing your UTI.
  • However, it's important to remember that MIC tests are just one piece of information used by doctors to determine the best treatment for an infection. Other factors, such as your overall health, severity of the infection, and potential for allergies, also play a role.

What to do next:

  • Don't rely solely on this information to decide on your treatment: Discuss your complete lab results and any concerns you have with your doctor.
  • Your doctor will consider all relevant factors: They will interpret your MIC result in the context of your specific case and make the best treatment decision based on their expertise and your individual needs.
  • Do not self-medicate: Avoid taking any medication, including Bactrim, without your doctor's prescription and supervision.

Remember, the most reliable way to know if Bactrim is the right treatment for you is to consult your doctor. They can provide personalized advice based on your specific case and ensure you receive the most appropriate care.

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