The first thing you need to determin is if the test are for determining your health or are they drug test. A drug test requires your concent and signature. If it is a drug test, I suggest that in order to be 100% certian of keeping your private life private, that you substitute a clean sample. I would recomend Dr. John's for an insurance test. It is available at this link for $30.
urinator.com

Read the Substitution guidelines linked to in my signature at the bottom of this post. Hope that helps. N2