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Be as clear as possible that you don't want your parents to find out about your test. Make sure that the staff at the clinic will not accidentally call your house to deliver your results, or send them to your house through the mail. Ask the staff to make a note of such details in your file in order to prevent accidents. Also make sure your parents won't receive a bill for the testing or treatment. Tell the doctor or nurse about how you are feeling about the testing or your health. They are there to help both your body and mind. Express concerns about depression or fear if you have them. They will be able to help or provide additional resources. Be prepared to answer some very invasive questions about your sexual history, but know that they're not asking these questions to judge you. They need that information to make the best decisions about your testing and health. Furthermore, there's nothing you've done that they haven't heard before, so be perfectly honest in all of the answers you give to their questions. Also be prepared that they may need the names of your sexual partners, especially if any of your tests are positive. The best way to deal with your situation and to prevent future mishaps is to educate yourself. Before the test begins, ask them to walk you through the process before they begin to set your mind at ease. It's easier to stay calm when you know exactly what will happen. The wait-time on the test results will vary based on what diseases they're testing for and the backlog in the clinic's laboratory, so ask how long you'll have to wait to hear back from them. Don't put your house number down for the result delivery. Give them your cell phone number, or that of a friend or trusted relative (with his or her permission, of course) if you don't want to risk your parents picking up your cell phone. If the clinic staff doesn't like that idea, ask them to wait for you to call them for your results, rather than them contacting you. It may also be possible for you to access your results online.
Be blunt about your concerns. Do not forget about your emotional health. Answer the medical staff's questions honestly. Ask questions. Prepare to wait for results. Provide a secure phone number for the results.