Labetix Urinalysis

Has anyone ever had this urine test? I dont know if it tests for THC or not but I get it once a year for a medical for boxing to see if I am fit to box. Is it the law to warn people when they are being tested for drugs? In the past I have abstained from drug use for a while beforehand to make sure I was clean just in case, but do I have anything to worry about? On the test it says something about checking for kidney stones or something. But I really can not test positive for THC so I abstain anyway.