You should keep numerous things in mind before performing a hearing test by yourself or even at a health care center. The first thing is, to clean your ears at least two days before the actual test takes place. There should be no amount of earwax present inside your ears. Otherwise, the results may differ.  Avoid direct or indirect exposure to loud noise hours before performing the test, as the loud noises can compromise your hearing abilities temporarily. Hence if you get the test done in the meantime, then you can get very misleading results.  If you're sick or suffering from some illness, then you can avoid the hearing test until you get better and come back to your usual self. These things can sound like nitpicking, but these can make a significant difference in your test results that can mislead you in a different direction from the original.