Sleep Lab Diagnosis is a medical procedure used to diagnose sleep apnea. Sleep apnea is a disorder in which a person's breathing is interrupted during sleep. Sleep Lab Diagnosis involves monitoring a patient's breathing, heart rate, and other vital signs while they sleep in a laboratory setting. The results of the diagnosis can help doctors determine if a patient has sleep apnea and what type of treatment is necessary. The term APNEA, which is five letters long, is an acronym for 'Obstructive Sleep Apnea Syndrome'.