Hi Conor, the synthetic urine created by Clear Choice is exactly like real urine and has all the components including uric acid, urea and it is balanced for pH, specific gravity and creatinine. If you use this synthetic urine it doesn’t matter whats in your own urine. Its irrelevant. To ensure their urine is not flagged as suspicious instead of adding preservatives (like some of the cheaper brands like Quick Fix for example) their urine goes through a sterilization process and no kind of preservatives or other ‘non real’ substances are added. Its as life like as you can get. You can use the heat pad to heat up to the ideal temperature or use heat activator powder that comes with the kit. Good luck with your test!