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Sleep Lab Tests

University Hospitals Elyria Medical Center Sleep Labs are full service facilities offering the following tests:

Polysomnogram (PSG) Study*

This is the basic sleep study test which will help the physician diagnose the cause of the sleep disorder.  It consists of an overnight study in the sleep lab in which you will be monitored with special equipment that records brain activity, breathing, cardiac patterns and leg movements.

Positive Airway Pressure (PAP) TITRATION*

This study is ordered after you have been diagnosed with sleep apnea.  Depending on the physician's preference, the patient may or may not have been fitted with a PAP mask and machine before coming into the lab.  This overnight study helps determine the best pressure for the patient, which in turn, will help decrease or eliminate sleep apnea and snoring.


This study is the combination of the above two studies.  For the first part of the study, the PSG is run.  If you exhibit more than 20 respiratory events an hour during the first two hours of the study, then the technologist will wake you and initiate the CPAP titration.

Multiple Sleep Latency Test (MSLT)

This test is run the morning following a PSG.  It is a test to help rule out narcolepsy.  The PSG study is necessary the night before the MSLT to assure that you are not excessively sleepy during the day due to sleep apnea or insomnia.  The MSLT is a series of 4-5 naps that run for 20 minutes every 2 hours, starting 2 hours after the end of the PSG.

Maintenance of Wakefulness Test (MWT)

This test is performed during the day.  It may or may not follow a night time sleep study, depending on the physician's order.  It is run in a manner similar to the MSLT, except you are instructed to resist sleep.  The Federal Aviation Administration, Ohio Department of Transportation, trucking companies and similar types of employers may request that you have this test done for safety reasons.

*The PSG, CPAP Titration and the Split Night Studies can also be run during the day for anyone who works a night shift position.

For more information about our sleep labs, please contact UH Elyria Medical Center at 440-326-5464.

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