When a patient with sleep apnea returns with a new prescription for CPAP settings, what should the sleep technician do?

When a patient returns with a new prescription for CPAP settings, the appropriate action for the sleep technician is to adjust the CPAP machine accordingly. This is crucial because the prescribed settings are tailored to the individual's current needs based on their sleep apnea diagnosis and any changes in their condition. Implementing the new settings ensures that the patient receives optimal therapy to effectively manage their sleep apnea, improving their overall health and quality of sleep.

Adjusting the CPAP settings is vital for ensuring that the prescribed pressure levels are delivered effectively, which can mitigate the symptoms associated with sleep apnea, such as excessive daytime sleepiness, and improve night-time breathing. Thus, following the updated prescription directly addresses the patient's treatment needs.

The other options are less appropriate in this context. Replacing the CPAP machine or advising a new sleep study may not be necessary unless significant issues are present with the current machine or if there are substantial concerns that the current settings may not be effective. Verifying the prescription with the physician could be a prudent step if there’s uncertainty about the prescription details or if adjustments raise questions, but it typically isn’t the first necessary action when clear updated settings have been provided.