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Types of Sleep Tests
The Sleep Study - Polysomnogram (PSG)
The primary method for diagnosing a sleep disorder is the polysomnogram (i.e. sleep study). This requires patients to spend the night in one of six comfortable rooms that are sound and light controlled and include a television and video player. A full bath with shower also is available.

During the test, various sensors are attached to your body in order to record essential information while you sleep, such as brain waves, breathing, heart activity, leg movements and oxygen levels. The sensors usually do not affect your sleep and can easily be removed if you need to get up during the night.

In most cases, the sleep study begins around 10:30 p.m. and continues until you are awakened between 5 and 6 a.m. However, daytime sleep studies are available for those who work nights. A sleep technologist will monitor you throughout the study.

CPAP (Continuous Positive Airway Pressure) Titration/Re-Titration Study / BiPAP
A CPAP titration or re-titration study is offered to patients whose course of treatment is CPAP (Continuous Positive Airway Pressure). During the CPAP titration or re-titration study, various levels of pressure are tested on the patient until the CPAP pressure is found that alleviates any obstructive apneas and snoring which are occurring.

If a patient is currently utilizing CPAP but the previous symptoms are recurring (apneas, snoring, or daytime sleepiness, etc.), a CPAP re-titration study may be necessary to determine the patient’s correct pressure setting.

State-of-the-Art Technology - BiPAP AutoSV Ventilation
Carroll Hospital Center's Sleep Disorders Center is one of the few sleep centers in Maryland to offer BiPAP AutoSV Ventilation. This advanced technology tracks how a patient is breathing prior to falling asleep and while the patient sleeps; the machine will match the person's breathing pattern. Unlike regular fixed pressure ventilation systems, this highly sensitive equipment is most effective in the treatment of complex sleep apnea.

Multiple Sleep Latency Test
Another sleep test available at the Sleep Center is the multiple sleep latency test (MSLT). It is used to diagnose narcolepsy and excessive daytime sleepiness. The test begins early in the morning and consists of a series of 20- to 30-minute naps given every two hours. The same kind of information is recorded as for a polysomnogram and the test is typically completed by 5 p.m.

Maintenance of Wakefulness Test
A maintenance of wakefulness test (MWT), which measures your ability to stay awake during a designated wakeful time, also is available. Patients are monitored while sitting in a softly lit, quiet room for 40 minutes every two hours, beginning early in the morning and ending around 5 p.m. Usually, the MWT test is for patients whose occupation requires them to be alert throughout the day, such as truck drivers, bus drivers and pilots.

Results and Treatment
After your sleep study, a physician specializing in sleep disorders will review the results and make treatment recommendations. It usually takes less than a week for the study results to be scored and interpreted. Results are then sent to your referring physician.

You should contact your physician to obtain your sleep study results and get appropriate treatment or visit our sleep specialist at the Sleep Disorders Clinic for further management. To make an appointment at the Sleep Disorders Clinic, call 410-871-7170.