A soft round red tissue was found in red colored urine. i got a urine analysis done which came out negative for all the factors except for traces of blood. what could the red tissue be?

Hematuria: Must see a urologist. Something causing blood in urine. If no infection seen in urine, i worry more. Please see a urologist, you may need a cystoscopy.

See below: Probably a blood clot. You need to see a local urologist for an evaluation.

See a Urologist: Gross blood or blood you can see in urine should be evaluated by a urologist. It may require some urine tests, ct scan imaging and possibly a cystoscopy (or direct look in the bladder with a small scope). Questions to consider: any pain with blood, any associated symptoms, are you a smoker or not, any other voiding (peeing) issues? See your pcp for a referral.

Discuss with doctor: If it might be appropriate to have a urine cytology test if you are passing tissue in the urine. It is most likely a blood clot, however, bladder tumors can be very friable and little pieces can break off and pass in the urine. Usually these pieces are so small that we can only see them with a microscope.