Sleep Disorders Diagnostic Center
410.641.1100 x 5118
The CPAP study is used to set the right level of continuous positive airway
pressure (CPAP) therapy. This therapy is used for people with sleep related
breathing disorders. These disorders include the following:
- Obstructive sleep apnea (OSA)
- Central sleep apnea (CSA)
- Hypoventilation and hypoxemia
When would this test be necessary?
During an overnight sleep study, you may show signs of having OSA. If
it seems to be very severe, then a CPAP study may be performed right away.
Doing both studies in one night is known as a split-night sleep study.
If the sleep study shows that the OSA is mild to moderate, then the CPAP
study may not be performed right away. The doctor may wait to review the
results of the entire night of the sleep study. Then he or she will decide
if you need to come in for a second sleep study. If you do, then the CPAP
study would be performed at that time.
During the CPAP study, you are fitted with a nasal mask. The mask is connected
by a tube to a small electric unit. The unit has a fan that pushes air
through the tube. The mask allows the air to gently blow into the back
of your throat. Pressure is started at a very low level. It is then increased
at various intervals during the night. The goal is to find the right level
of air pressure that will prevent the collapse of your upper airway. This
eliminates pauses in your breathing as you sleep.
Who reads it?
A technologist is the first one to look over the data from a sleep study
and a CPAP study. First, he or she will chart your sleep stages. Then,
he or she will look for any events of abnormal breathing or leg movement.
He or she will also record how events of abnormal breathing decreased
once the CPAP mask was used. The results of a CPAP study are always reviewed
by a specialist who is certified by the American Board of Sleep Medicine.
The doctor will review the study to find out what level of CPAP treatment
will work best for you on an ongoing basis.
How do I get the results?
It usually takes about two weeks to get the results of a CPAP study. At
times the doctor who takes a look at the study needs to get more information.
He or she may talk to the technologist or to the doctor who sent you to
the center. The doctor who ordered the study will discuss the results
with you. If your primary care doctor ordered it, then the results are
sent to him or her. If you met with a doctor in the sleep center, then
he or she will tell you the results. You are then able to be fitted for
a mask and to obtain a CPAP unit for use in your home.