Which of the following is a mandatory component of an order for a polysomnography (PSG)?

A mandatory component of an order for polysomnography (PSG) is that it must be signed by a medical doctor (MD). This ensures that the order is valid and that a qualified healthcare professional has reviewed the patient’s condition and deemed the sleep study necessary. The signature not only signifies approval but also helps maintain accountability in the patient’s care.

While patient medical history, information about medications, and follow-up referrals are all important in the broader context of managing a patient's sleep disorders, they are not strictly required for the order itself to be considered valid. It's the MD's signature on the order that confirms the legitimacy and medical necessity of the polysomnography. This aspect is critical for both administrative processes and for ensuring the legality and professional integrity of the healthcare service provided to the patient.