Case Presentation: A 22-year-old healthy female presented in April 2021 for abdominal pain during menstruation. Vital signs and workup with blood counts, metabolic, pregnancy, and sexually transmitted infection panels were unremarkable. Urinalysis showed nitrites, pyuria, bilirubin, and urobilinogen. Ultrasound and CT of the abdomen/pelvis were unremarkable. She was diagnosed with cystitis and prescribed cefuroxime. Urine [...]