<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I think I have urethritis. Ive been experiencing a burning sensation while peeing and theres a constant urge to go to the bathroom.  <response>: Okay, to properly diagnose urethritis, we will need to perform a few medical tests. We will start with a urinalysis, a chlamydia test, and a microscopic examination to check for bacterial smear, culture, and toxicology. In addition, we may need to do a blood culture and an HIV screen. If necessary, well perform an endoscopy and endoscopic biopsy of the urinary tract. We may also need to insert an indwelling catheter. 