How do you fail a sleep apnea test?

See response: Not sure what is meant by failing sleep apnea test; i.e., does that imply that apnea showed up on nocturnal study, or that you were unable to sleep and the study was inadequate? A sleep specialist can provide both guidance and assistance.

AHI: Apnea hypopnea index is defined as the number of these events recorded in a psg test per hour of sleep. It is the standard by which a board certified sleep specialist uses in diagnosing the level of obstructive sleep apnea and makes recommendations of treating a particular condition.