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Levels of Sleep Studies

There are four levels of sleep studies that are able to diagnose obstructive sleep apnoea (OSA).

Level Four

Level four is the most basic type of sleep study. It is only really a screening tool for OSA using oximetry that directly measures heart rate and oxygen levels, using this data to infer respiratory obstructions and arousals out of sleep. It is easy for these types of studies to miss subtle obstructions and give low-accuracy insight into sleep quality or total sleep time. A level four study is usually a disposable device worn around the wrist or on a single finger.

Level 4 Sleep Study Set Up

Level Three

A level three study is a basic home-based sleep study that measures breathing airflow and effort, oxygen and heart rate. It can accurately detect the presence of OSA but like level 4 has low accuracy when it comes to sleep quality or total sleep time.

Level 3 Sleep Study Setup

Level Two

This is the level of sleep study offered by Home Sleep. Along with breathing, oxygen and heart rate data, we can also directly measure brain and muscle activity and body position. Brain activity tells us exactly when someone is asleep, as well as which of the 4 stages of sleep they are in. OSA often varies between sleep stages and sleeping position, so having this extra data can help highlight the right treatment strategies. Home Sleep’s studies also look at jaw muscle activity which can screen for sleep-related bruxism (or teeth-grinding). We also have the option of measuring leg movements which can diagnose periodic limb movement disorder.

Level 2 Sleep Study Set UpLevel One

The only difference between a level one and level two study is a level one study is conducted in a sleep lab with a sleep technician observing the sleep study in real time. Level one studies are useful in particularly severe cases or in cases when there is a suspected sleep disorder not related to breathing or leg movements. For diagnosing OSA, level one and two sleep studies give the same information. The benefit of a level one study is if a sensor falls off or there is another technical issue during the study, there is a trained technician who can solve the issue before it ruins the rest of the study. The downside of a level one study compared to level two is the experience of sleeping in a hospital compared to sleeping at home in one’s own bed.

Level 1 Sleep Study Set Up

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Sleep Questionnaire

The Epworth Sleepiness Scale helps you determine if you possibly suffer from a sleep disorder and its severity. This scale was developed in 1991 by Dr. Murray Johns right here in Melbourne.

Our sleep questionnaire assesses your sleepiness along with some common risks and symptoms to determine your likelihood of a sleep related issue. Complete the questionnaire now and find out if you require a diagnostic sleep study.

How likely are you to doze off or fall asleep:
Sitting and Reading?*

How likely are you to doze off or fall asleep:
Watching TV?*

How likely are you to doze off or fall asleep:
Sitting, inactive in a public place? (e.g. a theatre or a meeting)*

How likely are you to doze off or fall asleep:
As a passenger in a car for an hour without a break?*

How likely are you to doze off or fall asleep:
Lying down to rest in the afternoon when circumstances permit?*

How likely are you to doze off or fall asleep:
Sitting and talking to someone?*

How likely are you to doze off or fall asleep:
Sitting quietly after a lunch without alcohol?*

How likely are you to doze off or fall asleep:
In a car, while stopped for a few minutes in the traffic?*

Is your waist circumference greater than
102cm (male) or 88cm (female) at the belly button?*

Has your snoring ever bothered other people?*

Has anyone noticed that you stop breathing during your sleep?*

Are you aged 50 or over?*

Analyze your score

Sleepiness Scale

OSA-50 Sleep Apnea
Risk Screening


Thank you for taking the time to complete the online sleep assessment.

Studies have shown that the quality of your sleep can significantly affect our health and our quality of life.

So, if you are concerned about your sleep always be sure to speak with your GP.

If you provide your email address the results of this online sleep assessment will be sent to you directly to discuss with your doctor.

*Please note: To be eligible for the Medicare rebate for a sleep study either home based or in-lab the clinical need for a sleep study requires to be determined by approved sleep assessment tools which can only be administered by a medical practitioner. A referral from a medical practitioner will also be needed.

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