<i>It could not. A hearing test requires an environment with exceptional isolation</i> Don't be so picky. Or don't let the perfect be the enemy of the good enough.

An improper hearing test can result in an improper amplification curve, which can lead to further hearing loss.

Perfect is perfectly acceptable to aim for, when it comes to your hearing for life.

A hearing test is done to compare your thresholds to what is considered "normal".

Without controlled test environment you cannot compare as your test environment will change your thresholds, and therefore make the test invalid.