Hello and welcome to HCM.
Thank you for your query.
First of all, I do not doubt the laboratory you visited, but at times, an inexperienced laboratory technician can miss the crucial points that help in making a diagnosis, and thus, report a negative result. I request you to repeat the urine analysis or go for a more specific investigation like a urine culture and sensitivity examination at a more experienced and well-renowned laboratory. This will ensure accurate results.
Once this is done and if the report is still negative, going for a screening of sexually transmitted diseases will be another option, along with and abdominal and pelvic ultrasound
, to rule out/diagnose other abnormalities of the renal system.
I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications. I would gladly help you.