Thank you for sharing your cat's experience with blood in cat urine and crystals.
1) First and foremost, get your cat to the vet! You need to make sure you’re not dealing with an underlying medical issue. Your vet will want to get a urine sample to look for bacteria, crystals, blood, and other clues. They may suggest x-rays if they suspect a bladder stone, or blood work if they are concerned about a systemic medical issue, such as diabetes.
My cat is 13 years old and for 2 days has been passing blood through his urine.. I took him to the vet today.. and the Doctor said it could be a possibility of Kidney Stones, or a Diagnosis, he was Urine Tested and we found out that VERY COMMONLY male cats form crystals in their urethra's. Luckily, there are anti-biotics to stop the infection and specially made Purina Prescription Urinary food, which is high in magnesium to dissolve these crystals!!! and if your cat has kidney stones, do not worry!! Recently, vets have formulated a food meant to dissolve these kidney stones, whereas in the past surgery was the only option. Take your kitty to the vet ASAP!! The longer you wait the more complicated and expensive it is.
Also, cat urine forms crystals once outside of the bladder.
Crystals in the Urine in Cats | petMD
In the beginning, crystals will cause the opening of the urethra to become blocked partially, so there still may be a trickle of urine. As the problem progresses, however, the trickle slows to a complete blockage. Sometimes the bladder ruptures. Generally, once a cat becomes totally blocked it takes three days to die and it's a horrible, painful death. They will begin crying in pain, and eventually the pain will put them into a coma. It is cruel to let a cat die that way. Diet can control the amount of crystals in a cat's urine. Cheap foods found in supermarkets are full of dyes and are high in ash. Both can cause crystals to form. Check the labels for cat foods that say "for urinary cat health." Also, mixing canned wet food with the dry food is helpful, as the fluid in it helps move the fluids through the cat's body and out, before the urine can get highly concentrated and become crystallized. Don't give them cow's milk, because it is not a natural food for cats. Wet food and lots of water will help more than anything. Sometimes the cat can be catheterized and just the insertion of the catheter will enlarge the opening and allow urine to run freely again. But if measures aren't taken to prevent crystals from forming again, he will become blocked again. If catheterization doesn't work, surgery will have to be performed, which slits the penis and allows urine to flow. This surgery can cost upwards of a thousand dollars. Why do cat crystals form? Cat crystals are tiny crystals that can develop in your cat’s urine & may cause your kitty significant irritation, pain and possibly even an infection. The actual cause of cat crystals is not well understood, but we do know that the following can predispose cats to them: