I have a constant UTI. I am on anti biotics all the time. Docters want a culture but I can't take one unless I'm off antibiotics. How many days do I have to be off antibiotics so I don't recive a false negative reading but an accrate reading. 3 days wasn't long enoughto be off anti biotics last time. If I'm off antibiotics for 4 days I end up in the emergency room in pain and can't urinate. Help!