Murray - Hopefully this question is not being asked because you are illegally or abusively using this medication. Abuse of valium and other medications from this class is dangerous. How the body excretes it is a function of the efficiency of the liver, weight and age. How long it will take to totally clear the system is a function of these factors. What will be detected is also a function of which metabolites the test measures.   Rick Wirtz   Rick Wirtz is a Psychologist, not a Psychiatrist. Although the majority of Psychologists are not authorized to prescribe medications or give you specific advice about them, they typically have experience working with patients who take a variety of medications. The response above is not intended to diagnose or treat any medical or mental disorder. Any information given in a post about medication is for educational purposes only and primarily to aid you in having an informed discussion with your own physician.