Catrine Pearl Cat litter has been designed as a stress free way to get a sterile urine sample from a cat. Simply use the Catrine Pearl litter - then use the sterile syringe to draw out the urine. The Catrine Pearl litter does not absorb the urine nor change the urine in anyway. No more having to take your cat to the vet to get a urine sample and normally pay for a stressful overnight stay.