<s>[INST] 36 year old male. Hours after ejaculation I have brown particles in my urine. I have seen a urologist and had a CT scan and an x-ray and they found nothing, went back for a cystoctomy to scope the inside of my bladder and found nothing unusual. I did find out after the x-ray and CT scan that I only have one kidney; I never knew that. I have no abdominal or back pain, nor do I have pain during urination, I only know that something came out when I look into the toilet. I called my urologist after this happened again, I acquired a sample to bring in, they told me its probably a blood clot and not to worry about it and not to bring in the sample. I also have a hydrocele/vericocele on my right spermatic chord. [/INST] HelloThanks for query. Based on your statement that you have posted the brown particle that you have passed in urine hours after ejaculating is likely to be a blood clot mixed with urine which gets turned up into brown color. In the majority of cases this blood clots originates from a small superficial surface of prostate and gets sealed off itself immediately that causes a tiny blood clot to appear either in semen or urine passes after ejaculation. Since this is single episode and all the tests like C. T scan, X-ray and Cystoscopy did not reveal any pathological lesion you should not worry about it. If you have pain or discomfort due to Varicocele that you have on Rt side use scrotal support. This will prevent sagging of testicles and give relief from pain or discomfort. Chat Doctor.  </s>