Understanding your sleep study results

Your diagnostic sleep study report

 

Your doctor ordered an overnight sleep study (also called a polysomnogram or PSG), either in a sleep centre or your home, to determine if you have sleep apnea. After you complete the sleep study, your doctor will give you the results and discuss what to do next.

 

You may be given a copy of your sleep study report. If so, the report may be filled with terms you haven't seen before. Below is an example of what is typically included in a diagnostic sleep study report along with descriptions of what is being reported.

Diagnostic sleep study report

 

Name: Doe, John

 

Height: 73"

 

Test Date: 8/9/2012

 

DOB: 21/1/1973

 

Weight: 91 kg

 

 

 

Age: 39 YRS

 

BMI: 27

 

Referring physician: Dr. Acula

 

Sex: Male

 

Test: #136

 

 

Mr. Doe is a 39 year-old male referred by Dr. Smith with symptoms of snoring and excessive daytime sleepiness. His bed partner reports that Mr. Doe has apnea episodes and wakes up gasping for breath several times during the night. The patient is 73 inches tall and 91 kg with a BMI of 27.0. He is significant for a Mallampati class 3 oropharnyx.

The medical history is significant for hypertension. His current medications are Lisinopril and Prilosec. The patient's normal bedtime is 10:30 pm. A full in-lab Diagnostic Polysomnography was ordered to rule out the diagnosis of obstructive sleep apnea (OSA).

 

Apnea/hypopnea index
18.8
Total respiratory events
104
Central apneas
Central hypopneas
12
Mixed apneas
1
Obstructive apneas
91
Obstructive hypopnoeas
0
RERA count / RERA index
0 / 0.0/hr
RDI
0.0
Respiratory events by body position
Supine AHI
31.5
Lateral AHI
35.4
Prone AHI
0.0
Oxygen saturations
Mean SpO2
96%
Lowest SpO2 during sleep
84%
Limb movements
Leg movements
562 / 81.2
PLMS
453 / 65.4
PLMS Arousals
55 / 7.9
Sleep times
Lights out
10:07:44 PM
Lights on
5:25:02 AM
Total bed time (min)
437.3
Total sleep time (min)
357.0
 
Sleep efficiency
81.6%
Sleep latency (min)
11.6
REM latency (min)
33.1
WASO (min)
27.2
REM
NREM
Arousals
Awakenings
Ar + Aw
Ar + Aw Index
Respiratory events recorded in each category:
0
16
21
6
27
3.9
Snore:
11
25
58
15
73
10.5
Spontaneous:
10
12
28
3
31
4.5
Total:
21
53
107
24
131
18.9
Arousal Index:
18.0
12.2
15.5
3.5
18.9
- -

The report above is an example of a diagnostic sleep report, where you are tested to determine if you have a sleep disorder.

 

Other reports include:

 

  • a CPAP titration study report, which is the result of a separate study to fit you with a CPAP device and mask after you have been diagnosed with sleep apnea

  • a split-night sleep study report, in which a CPAP titration study on the same night as an in-lab sleep study. This is known as a split-night sleep study. The CPAP titration occurs in the second half of the night.
Apnea/hypopnea index (AHI)
Arousal Index
Respiratory events by body position
Oxygen saturations
Limb movements
Sleep times