I am an LPN in LTC, I have a question about C-diff. When a patient is treated for c-diff with flagyl we are being told by the NP that works with the doctor that you have to wait 30 days to retest the patient for c-diff. She is saying that you will not get accurate results. I have tried to google this and other search engines, I cannot find anything say yes or no to this. Is this true?