I'm not a doctor (MD, that is) but I would interpret that in this way. (You may want to google Urothelium in wikipedia for a starter). I interpret "Rare red blood cells to mean that there are very few of them. Crystals suggest to me that you might want to drink plenty of water, as they could be part of what is causing the mild inflammation. You might want to cut down or eliminate some of the things that kick your baldder into action.
I had this as well I'm only 20, I've been too a lot of doctors and when I did my urine test it always comes back saying they found billed cells in my urine , they thought it was a UTI at first but no bacteria was found they thought maybe it was kidney stones so they checked my kidneys and everything was fine , my doctor said I should see this guy tomorrow about looking into my bladder to see what's going on