Hello,
Microscopic hematuria can be due to urinary tract (bladder) infection, swelling in the filtering system of the kidneys ,stone in bladder or in a kidney, blood disease, like sickle cell anemia, certain medicines and tumors in the urinary tract.
You have already undergone cystoscopy which has ruled out most of the cases. I suggest you to get done an ultrasound abdomen to look for any kidney stone and blood tests for sickle cell anemia.
I hope it helps. Take care and please do keep us posted on how you are doing. Kind regards.
Thank you for all of this imformation. I do have a couple of questions. If I had stones wouldn't I have discomfort? I'm white and thought sickle cell affected blacks mainly. Although, my son was alpha thalassema trait positive at birth. Are those diseases similar?