Home Sleep Test | Belun Ring® Sleep Study

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Home Sleep Apnoea Testing with the Belun Ring

• At $300 NETT, inclusive of GST
• Simple, comfortable ring-worn device that records sleep apnoea data overnight
• Results reviewed by our doctors with personalised next steps

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Located in Tanjong Pagar, Orchard, Jurong & Novena

Medically Reviewed By: Dr Leonard Leng – MBBS, MMed (FM), GDOM, DWD
Last updated: Apr 15, 2026

A home sleep test is a portable diagnostic tool that monitors your breathing, oxygen levels, and other sleep-related measurements overnight in your own bed. Also known as a home sleep apnoea test (HSAT), it is primarily used to detect obstructive sleep apnoea (OSA), a condition where the airway repeatedly collapses during sleep, causing pauses in breathing.

Unlike an in-lab sleep study (polysomnography), which requires an overnight stay in a sleep laboratory, a home sleep test uses a small, wearable device that you set up yourself. It records enough data for a doctor to determine whether you have sleep apnoea and how severe it may be, while letting you sleep in familiar surroundings.

Home sleep testing has become an increasingly common first-line diagnostic option in Singapore, particularly for adults with a moderate to high likelihood of OSA based on symptoms such as loud snoring, witnessed breathing pauses, and excessive daytime sleepiness.

A home sleep test measures breathing patterns, blood oxygen levels, airflow, and respiratory effort to identify disruptions during sleep. The specific data points depend on the device used, but most home sleep test kits monitor the following:

Not all devices measure every parameter listed above. Traditional multi-sensor devices may include nasal breathing sensors, chest belts, and finger oximeters, while newer ring-based or wrist-worn devices focus on oxygen saturation, heart rate, and movement, using clinical-grade sensors and algorithms to derive respiratory event data with fewer points of contact.

Home sleep tests are widely considered accurate for detecting moderate to severe OSA in adults whose symptoms and risk factors strongly suggest the condition.

Multiple studies have shown that home sleep test results closely match those of in-lab polysomnography when the patient's symptoms and risk profile already point towards sleep apnoea.

However, there are important caveats:

• Mild Sleep Apnoea May Be Missed – Some home sleep test devices cannot tell whether you are asleep or awake, which can reduce precision. Even devices that estimate sleep stages are less reliable at detecting mild OSA.
• Central Sleep Apnoea Is Not Reliably Detected – Central sleep apnoea, where the brain temporarily stops sending signals to breathe, and other non-obstructive sleep disorders are not reliably detected by home sleep testing devices.
• Accuracy Depends on Sensor Placement – Home sleep test accuracy depends on the sensors staying in place overnight. If a sensor shifts or detaches, the recording may be incomplete and a repeat sleep test may be needed.
• Other Health Conditions Can Affect Results – Conditions such as chronic obstructive pulmonary disease (COPD) or neuromuscular disorders can affect how sleep test results are interpreted, making a full in-lab sleep study more appropriate.

A home sleep test is most appropriate for adults who have symptoms strongly suggestive of obstructive sleep apnoea and no significant coexisting conditions that would require a full sleep laboratory study. You may be suitable if you:

• Have been observed gasping or stopping breathing during sleep
• Snore loudly and regularly
• Experience excessive daytime sleepiness despite a full night's sleep
• Have high blood pressure that is difficult to control, which can be linked to untreated sleep apnoea
• Have risk factors such as obesity, a large neck circumference, or a family history of sleep apnoea.

A home sleep test is generally not recommended if you:

• Are suspected of having central sleep apnoea or another sleep disorder (e.g., narcolepsy, insomnia, restless legs syndrome)
• Have significant heart or lung conditions that could complicate interpretation

In these situations, an in-lab polysomnography provides more comprehensive data for accurate diagnosis.

At ATA Medical, we use the Belun Ring for home sleep testing, a medical-grade finger ring that monitors for obstructive sleep apnoea without the discomfort of traditional multi-sensor devices.

The ring is worn on the finger like a regular ring and records data overnight using clinical-grade photoplethysmography (PPG) sensors, which use light signals to measure blood oxygen levels and pulse through the skin.

The Belun Ring captures blood oxygen saturation (SpO2), heart rate, and heart rate variability, providing pulse signal data and patterns that correlate with sleep-disordered breathing. A built-in accelerometer also records movement and body position to track motion and sleep restlessness.

Using validated algorithms, the Belun Ring derives the oxygen desaturation index (ODI) and estimates the apnoea-hypopnoea index (AHI) from these measurements, providing sufficient data to screen for moderate to severe obstructive sleep apnoea.

The Belun Ring Sleep Study Procedure

Why a Ring-Based Sleep Test?

A ring-based home sleep test like the Belun Ring removes much of the discomfort associated with traditional sleep apnoea testing devices.

A home sleep test is not a replacement for in-lab polysomnography in all cases. If your sleep test results are inconclusive or a more comprehensive evaluation is needed, a referral for a full sleep study can be arranged.

Preparing for a home sleep test involves following a few straightforward steps to ensure the device captures reliable data. Good preparation reduces the chance of needing a repeat test.

• Avoid alcohol and sedatives on each night of the test. These substances can alter your breathing patterns and affect the accuracy of results.
• Review the device instructions carefully before setting up. If you are unsure about any step, contact our clinic for guidance rather than guessing.
• Follow your normal routine. Sleep at your usual time and in your usual bed. The goal is to capture a typical night's sleep.
• Avoid caffeine in the afternoon and evening before the test, as it may make it harder to fall asleep.
• Do not nap during the day of the test, so you are more likely to fall asleep at your regular bedtime.

Your Belun Ring sleep test results are summarised using the estimated apnoea-hypopnoea index (AHI), which counts the number of breathing disruptions per hour.

The Belun Ring derives this estimate from oxygen saturation and pulse signal data (heart rate and heart rate variability) using validated algorithms. This number determines whether you have sleep apnoea and how severe it is.

Your report may also include:

• Oxygen desaturation index (ODI) — The number of times per hour your blood oxygen drops by 3% or more. A high ODI supports a diagnosis of sleep apnoea.
• Minimum oxygen saturation — The lowest oxygen level recorded during the night. Values below 90% may indicate a concern that warrants further evaluation.
• Estimated sleep time — Derived from movement and pulse signal data captured by the ring.
• Body position data — Whether breathing disruptions were more frequent in certain sleeping positions, such as on your back versus your side.

These results are interpreted alongside your symptoms and clinical history.

At ATA Medical, we offer the Belun Ring sleep study for home sleep testing, with pricing as follows:

Some integrated shield plans and private insurance policies cover sleep studies. It is best to check directly with your insurer before proceeding.

"The Belun Ring makes sleep apnoea testing far more accessible. You simply wear a ring to bed rather than managing multiple sensors and wires, which often leads to a more natural night's sleep and more reliable data to guide treatment."
— Dr Leonard Leng

"The Belun Ring makes sleep apnoea testing far more accessible. You simply wear a ring to bed rather than managing multiple sensors and wires, which often leads to a more natural night's sleep and more reliable data to guide treatment."

— Dr Leonard Leng

• Tanjong Pagar Clinic
• Orchard Clinic
• Jurong Clinic
• Novena Clinic