Final answer:
When a patient returns with a possible recurrent UTI and a repeat UA, C&S is negative, it is important to investigate non-infectious causes instead of changing the antibiotic or increasing the dose. Repeating the UA and C&S may not be necessary if the initial tests were negative.
Step-by-step explanation:
If a patient returns with a possible recurrent UTI and a repeat UA, C&S is negative, it is important to consider investigating non-infectious causes. This is because there could be underlying factors contributing to the symptoms that are not related to infection.
Changing the antibiotic or increasing the antibiotic dose may not be necessary if the urine culture and sensitivity (C&S) test is negative. This suggests that the previous antibiotic treatment was effective in clearing the infection.
Repeating the UA and C&S may not provide additional information if the initial test was negative. It is more appropriate to explore other potential causes of the patient's symptoms.