Ashwin Lewis
Sleep tests are often used to diagnose sleep disorders such as sleep apnea. Two common methods for testing sleep disorders are overnight oximetry and CPAP titration sleep studies. Overnight oximetry is a simple, non-invasive, at-home procedure that assesses blood oxygen levels, pulse, and breathing while the patient sleeps. The patient places a finger probe attached to a monitor on their finger for the entire night. The monitor records pulse oximetry data continuously, which is then reviewed by a doctor to determine abnormal drops in oxygen levels. CPAP titration sleep studies, on the other hand, are generally only needed for people who are being prescribed a CPAP machine, which emits air at a fixed rate all night. The purpose of a full-night CPAP titration study is to calibrate the CPAP machine's airflow rate to the sleeper's needs.
| Characteristics | Values |
|---|---|
| Purpose | To evaluate a patient for sleep apnea, monitoring breathing parameters such as pauses in and absence of breathing, and oxygen levels. |
| Who should use | People with signs of obstructive sleep apnea, such as snoring, snorting, or gasping while sleeping. |
| How to use | A plastic clip called an oximeter is applied over the end of the finger. It is connected via a cable to a small box that records the data overnight. It can also be connected to a CPAP machine to record data. |
| Data | Pulse oximetry data is recorded continuously and results in a graph. It measures oxygen saturation levels and can detect abnormal drops called desaturations. |
| Other uses | Can be used to ensure that sleep apnea treatment is effective and that oxygen desaturations noted in prior testing have resolved. |
| Limitations | Oximeters only provide a limited amount of information. Sleep position and sleep stages may impact oxygen levels, which simple devices cannot identify. |
| Other tests | Polysomnography, which records multiple body functions to monitor sleep stages. Electro-oculography (EOG), breathing sensors, and video and audio monitoring are also used. |
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What You'll Learn
How to prepare for a sleep test
Sleep tests are used to diagnose or rule out health issues related to sleep. They are often recommended when you experience symptoms of conditions that affect sleep, such as sleep apnea, narcolepsy, or insomnia. There are two main types of sleep tests: in-lab sleep studies and at-home sleep tests. Here is how you can prepare for each type of test:
In-Lab Sleep Study Preparation:
- Follow your healthcare provider's guidelines on bathing and grooming. It is generally recommended to bathe or shower before the sleep study, but avoid using creams, lotions, or hair care products afterward. Clean skin without any products is best for ensuring the sensors attach properly and provide clear readings.
- Refrain from using nail polish or fake nails, as these can interfere with pulse oximeter readings from your finger.
- Bring comfortable, loose pajamas and a change of clothes for the next morning.
- Avoid consuming alcohol and caffeine for a recommended period before the study, as advised by your healthcare provider.
- Take your regular medications as usual, unless instructed otherwise by your doctor.
- Take any additional medications prescribed specifically for the sleep study.
At-Home Sleep Test Preparation:
At-home sleep tests, specifically for sleep apnea, can be ordered by your primary care physician or a physician at a sleep clinic. These tests typically involve using an overnight pulse oximeter to monitor your breathing parameters, oxygen levels, and breathing effort.
- You can purchase overnight oximeter devices online or at pharmacies.
- The device typically consists of a plastic clip that attaches to your fingertip, connected to a small box that records data overnight.
- If you use a Continuous Positive Airway Pressure (CPAP) machine, it can be connected to the oximeter to record data simultaneously.
Remember to consult with your healthcare provider or sleep specialist for specific instructions related to your unique circumstances.
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Using an oximeter to monitor oxygen levels
An overnight pulse oximetry test is a commonly used screening test that evaluates blood oxygen levels. It can be easily done at home to provide basic information that may be useful in evaluating whether you have a common sleep disorder, like sleep apnea.
To use an oximeter, you typically apply a plastic clip over the end of your finger. This clip may be held in place with a piece of tape and is connected via a cable to a small box that records the data overnight. Newer devices may adhere directly to the skin and provide similar measurements. Within the overnight oximeter sensor is a red light that shines through your finger or the surface of your skin.
Oximeters record data continuously over the course of the night, which will result in a graph. This data can be reviewed by a medical provider to determine if there are abnormal drops in your oxygen levels, called desaturations. These drops may be recurrent in sleep apnea and can be associated with increases in heart rate. Levels below 88% indicate a condition called hypoxemia, which requires prompt medical attention.
It is important to note that oximeters only provide a limited amount of information and cannot be used to diagnose sleep apnea. They also provide only estimates of blood oxygen, and readings can be several percentage points different from a person's actual level. Therefore, it is recommended to discuss any concerns about blood oxygen levels with a doctor, especially if you are experiencing other symptoms of insufficient oxygen.
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Using CPAP to enhance breathing patterns
Obstructive sleep apnea (OSA) is a condition where your breathing is interrupted during sleep, often for more than ten seconds. This happens when your throat and chest muscles relax, narrowing your airway and impeding your breathing.
Continuous positive airway pressure (CPAP) is a treatment for OSA that delivers a continuous flow of pressurised air to keep your airways open while you sleep. CPAP machines take in room air, filter and pressurise it, and then deliver it through a tube connected to a mask. The continuous flow of air prevents your tongue, uvula, and soft palate from blocking your airway, stabilising your breathing and improving your overall sleep quality.
CPAP machines come in various types, including auto-CPAP, bi-level PAP, auto-bilevel PAP, and adaptive servo-ventilation (ASV). Auto-CPAP self-regulates by using a range of pressures to keep your airways open. Bi-level PAP uses two different pressures: a higher pressure when you breathe in and a lower pressure when you breathe out. Auto-bilevel PAP self-regulates both inhalation and exhalation pressures, while ASV monitors your breathing and adjusts the pressures to stabilise your breathing.
To enhance the effectiveness of CPAP therapy, it is important to select the right type of mask for your comfort and breathing habits. The different types of masks include nasal masks, nasal pillow masks, full masks, and hybrid masks. Nasal masks cover your nose and are recommended if you move around a lot during sleep. Nasal pillow masks only cover the nostril area and are more comfortable for those who wear glasses. Full masks cover both the nose and mouth and are suitable if you breathe through your mouth or have a nasal blockage. Hybrid masks are a variation of full masks that have prongs or cushions that seal your nostrils without covering the bridge of your nose.
In addition to using CPAP, overnight oximetry can be a useful tool to evaluate your breathing while you sleep. An oximeter is a small device that clips onto your fingertip or adheres directly to the skin and measures your oxygen levels throughout the night. By combining CPAP therapy with overnight oximetry, you can better manage your breathing patterns and address any sleep-related breathing disorders.
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Interpreting the results of a sleep test
Apnea-Hypopnea Index (AHI)
The AHI is a crucial metric in sleep studies, indicating the severity of sleep apnea. It is calculated by dividing the number of apneas (complete cessations of breathing) and hypopneas (partial obstructions) by the number of hours slept. An AHI score of less than 5 is considered normal for adults, while a score of 4 or lower indicates an absence of sleep apnea.
Oxygen Saturation and Heart Rate
Oximetry sensors in sleep tests measure oxygen levels in the blood. Optimal oxygen saturation should be above 95% most of the time, and levels below 90% are cause for concern. Sleep tests also monitor heart rate, and deviations from the normal adult resting heart rate of 60 to 100 beats per minute can indicate oxygen deprivation.
Polysomnography (PSG)
Polysomnography, or PSG, is a comprehensive sleep study performed in a lab setting. It involves monitoring multiple parameters, including electroencephalographic (EEG), electro-oculogram, chin and leg electromyogram, electrocardiogram, air flow, chest and abdominal wall movements, and oxygen saturation. PSG is considered the gold standard for diagnosing and evaluating the severity of sleep-disordered breathing.
Continuous Positive Airway Pressure (CPAP) Titration
CPAP titration studies are a type of PSG where the entire night is dedicated to adjusting the CPAP pressure to optimize the patient's breathing during sleep. This approach is particularly useful for patients who may not tolerate high CPAP pressures, and "ramp time" refers to the gradual increase in CPAP pressure as the patient falls asleep.
Home Sleep Tests
Home sleep tests, also known as out-of-center sleep tests (OCST), are smaller devices that patients can use at home. These typically include a pulse oximeter, strain gauges, and a nasal cannula. While home sleep tests are primarily used to diagnose sleep apnea, they may also identify other sleep disorders or conditions. However, they have limitations and may not capture certain subtleties of sleep disorders, such as the impact of sleep position and sleep stages.
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Further steps after a sleep test
After a sleep test, a healthcare provider will interpret the data and contact you to discuss the diagnosis and any further steps. This typically involves a follow-up visit to talk about your treatment options.
If you have been diagnosed with sleep apnea, your healthcare provider may recommend a continuous positive airway pressure (CPAP) device. This machine works by delivering air through a tube to a nasal cannula you wear over your nose or mouth while sleeping. The airflow gently pressurises your airway, preventing it from collapsing and interrupting your breathing.
Your healthcare provider will advise you on how to use the CPAP device and ensure you are comfortable with the machine. They may also recommend a sleep position trainer to help you maintain a side-sleeping position, which can aid in keeping your airway open.
Additionally, your healthcare provider may suggest lifestyle changes to improve your sleep quality. These could include weight loss, as excess weight can contribute to sleep apnea by increasing the tissue in your airway, making it more prone to collapse. Reducing alcohol consumption and avoiding sleeping pills can also help, as these substances can relax the throat muscles and worsen apnea.
It is important to note that overnight oximetry alone is often not sufficient to diagnose sleep apnea. Additional tests, such as polysomnography, may be recommended by your healthcare provider to ensure an accurate diagnosis and develop an effective treatment plan.
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Frequently asked questions
A sleep test is a diagnostic test that involves recording multiple systems in your body while you sleep. It is used to diagnose or rule out health issues that affect sleep.
An oximeter is a small adhesive sensor that is worn on the tip of your index finger. It reads your pulse and the level of oxygen in your blood. Data is recorded continuously throughout the night and will result in a graph.
CPAP, or continuous positive airway pressure, is a therapeutic device used to enhance breathing patterns and sleep quality. It can be connected to an oximeter to record data.
It is recommended that you bathe or shower beforehand, but avoid using creams, lotions, or hair care products. You should also avoid using nail polish or fake nails, as these can affect the readings.
A sleep test measures key body systems such as the brain, heart, and breathing. It can be used to diagnose conditions such as sleep apnea, narcolepsy, periodic limb movement disorder, seizures, and sleep paralysis.
