Evie Summers
Blood oxygen levels typically drop slightly during sleep, but if they fall too low, it could indicate an underlying health problem. Low blood oxygen levels can be caused by sleep disorders such as sleep apnea, or other medical conditions including lung disease, neurological disorders, or heart disease. If blood oxygen levels drop below 88%, this is considered dangerously low, and medical attention should be sought. Symptoms of low blood oxygen levels include fatigue, lightheadedness, shortness of breath, rapid heartbeat, and bluish skin. If left untreated, low blood oxygen levels can lead to serious health complications, including cognitive impairment, heart issues, and even death.
| Characteristics | Values |
|---|---|
| Normal blood oxygen levels | 95% to 100% |
| Low blood oxygen levels | Below 95% |
| Dangerously low blood oxygen levels | Below 92% |
| Blood oxygen levels requiring immediate medical attention | Below 88% |
| Sleep-related hypoxemia | Blood oxygen levels fall to 88% or below for at least 5 minutes during sleep |
| Obstructive sleep apnea | Repeated pauses in breathing caused by airway blockages during sleep |
| Central sleep apnea | Failure of the brain to send proper signals to the muscles that control breathing |
| Chronic obstructive pulmonary disease (COPD) | Damaged lungs struggle to maintain oxygen levels |
| Symptoms of low blood oxygen | Headache, difficulty breathing, rapid heart rate, bluish skin, fatigue, lightheadedness, shortness of breath |
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What You'll Learn
Sleep-related hypoxemia
Oxygen is essential for the proper functioning of the body. It is taken into the body through the lungs and circulated in the bloodstream, where it is used by tissues to create energy. When oxygen levels drop, the body may not work properly, potentially damaging the heart or brain over time. This condition is called hypoxia, which can be life-threatening in acute cases.
The symptoms of sleep-related hypoxemia include bluish skin, headaches, difficulty breathing, and rapid heart rate. These symptoms often overlap with sleep disorders like obstructive sleep apnea, which can affect both nighttime rest and daytime functioning. Obstructive sleep apnea (OSA) is a condition where the airway becomes repeatedly blocked during sleep, leading to breathing difficulties.
It is important to note that blood oxygen levels normally drop slightly during sleep, but not to low levels unless there is an underlying problem. Blood oxygen levels below 92% may be a cause for concern, while levels below 88% require prompt medical attention. Most experts consider an oxygen saturation level of 95% or below to be potentially abnormal for individuals at sea level.
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Obstructive sleep apnea
During an OSA episode, the airway becomes blocked, reducing or stopping airflow and resulting in hypopnea or apnea, respectively. Hypopnea refers to a reduction in airflow of at least 30% for more than 10 seconds, associated with at least 3% oxygen desaturation or arousal from sleep. Apnea occurs when breathing stops completely. These interruptions in breathing can happen at least 5 times per hour throughout the sleep period, leading to fragmented and non-restorative sleep.
OSA can range from mild to severe, depending on the frequency of these episodes. A measurement rating system called the apnea-hypopnea index (AHI) is used to classify the severity of OSA. An AHI of less than 5 is considered normal, while mild OSA is characterised by an AHI between 5 and 15. Moderate OSA is indicated by an AHI between 15 and 30, and severe OSA is diagnosed when the AHI exceeds 30.
The risk factors for OSA include a large or thick neck (greater than 17 inches for men and 16 inches for women), being middle-aged or older, and male gender. However, OSA can occur at any age, and it is estimated that up to 90% of people with OSA are undiagnosed. Snoring is one of the biggest symptoms of OSA, often interrupted with periods of quiet (apnea episodes) and then resuming with a loud sound as breathing starts again. Other symptoms include feeling sleepy during the day and not feeling well-rested after a night's sleep.
If left untreated, OSA can lead to serious health problems, including hypoxemia, which is characterised by low levels of oxygen in the blood. Hypoxemia can cause symptoms such as a headache, difficulty breathing, rapid heart rate, and bluish skin. In the context of OSA, hypoxemia is referred to as nocturnal hypoxemia, and if it persists over time, it can damage the heart or brain. Therefore, it is important to seek medical advice if you suspect you have OSA, as various treatments are available, including continuous positive airway pressure (CPAP) therapy, oral appliances, and surgery.
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Central sleep apnea
During CSA episodes, the upper airway narrows or nearly collapses, leading to a brief absence of ventilatory output and a decrease in blood oxygen levels. This condition can cause abrupt awakenings accompanied by shortness of breath, insomnia, excessive daytime sleepiness, difficulty concentrating, and mood changes. CSA can be diagnosed through a sleep study or overnight oxygen monitoring, and treatment options are available to manage the condition.
While minor changes in blood oxygen levels during sleep are normal, low oxygen levels can be dangerous. Blood oxygen levels below 92% may be a cause for concern, and levels below 88% require prompt medical attention. Low blood oxygen levels can lead to hypoxemia, a condition characterised by symptoms such as a headache, difficulty breathing, rapid heart rate, and bluish skin. Chronic or intermittent hypoxemia can damage the heart or brain and can even be fatal if left untreated.
People concerned about their blood oxygen levels during sleep should consult a healthcare provider. A doctor may recommend a pulse oximeter to monitor oxygen levels, and treatment options such as supplemental oxygen or continuous positive airway pressure (CPAP) devices may be prescribed depending on the underlying cause of the low oxygen levels.
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Oxygen levels and altitude
Oxygen levels in the blood normally drop slightly during sleep. However, they should not fall to low levels unless there is an underlying problem. Blood oxygen levels that fall below 88% during a sleep study are officially classified as low. Most experts consider an oxygen saturation level of 95% or below to be potentially abnormal for a person at sea level.
At high altitudes, oxygen levels may be significantly lower than at sea level. This is due to the lower barometric pressure, which results in oxygen molecules being spread further apart, reducing the oxygen content of each breath. The higher the altitude, the lower the average blood oxygen saturation. The decrease in pressure means that in a given volume of air, there are fewer molecules present, including oxygen. This is known as "hypobaric hypoxia". The reduction in oxygen availability in the air leads to a reduction in oxygen saturation in the blood and brains of people who are not acclimatized to the environment. This can cause Acute Mountain Sickness (AMS), a dangerous condition.
The decrease in pressure at high altitudes reduces the driving pressure for gas exchange in the lungs, producing a cascade of effects down to the level of the mitochondria, the final destination of the oxygen. This can lead to hypoxia, where the blood does not have enough oxygen to deliver to the organs and tissues, which can damage the heart or brain.
Oxygen levels can be measured through a blood test or by using a medical device called a pulse oximeter, which is typically clipped to a finger.
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Measuring blood oxygen levels
Blood oxygen levels indicate how many red blood cells carry oxygen throughout the body. Ideally, 100% of these blood cells carry oxygen, but this isn't always the case. A normal range for your blood oxygen level is between 92% and 100%. However, blood oxygen levels below 88% for five or more minutes during sleep may be a sign of a sleep-related breathing disorder like sleep apnea.
There are two main ways to measure or test blood oxygen levels: through a blood draw test and through pulse oximetry (using an oximeter). A blood draw test provides much more information about your oxygen levels than an oximeter does. A pulse oximeter can measure blood oxygen saturation levels through a small clip that’s usually placed on your finger or toe. An oximeter reading indicates what percentage of your blood is saturated with oxygen, known as the SpO2 level, as well as your heart rate. It’s a quick, non-invasive, and harmless way to check if someone’s blood oxygen level is too low.
Pulse oximeters are generally accurate, but it's important to note that skin pigmentation and texture, painted or artificial nails, skin temperature, and other variables can also impact oxygen level readings. As technology has improved, wearable devices that measure oxygen levels have become more popular. Even smartwatches, like the Apple Watch and Samsung Galaxy Watch, can help you track your oxygen level. However, the accuracy of these devices can vary based on the model and version, as well as how you wear them.
If you are measuring your oxygen level, you should seek medical attention if your reading is dropping below 90%—especially if you are experiencing any symptoms of low oxygen levels, such as shortness of breath, dizziness, or disorientation.
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Frequently asked questions
Blood oxygen levels below 95% are considered low and may require medical intervention. Levels below 92% are a cause for concern and anything below 88% is considered dangerously low and requires immediate medical attention.
Low blood oxygen levels can cause hypoxemia, where tissues and organs are deprived of the oxygen they need to function. This can lead to fatigue, lightheadedness, shortness of breath, cognitive impairment, and an increased risk of stroke and brain aneurysm.
Several factors can cause low oxygen levels during sleep, including sleep-related breathing disorders such as obstructive sleep apnea and central sleep apnea, as well as underlying medical conditions such as lung disease, heart disease, or neurological disorders.
You can monitor your oxygen levels using a pulse oximeter, which is a small device that is typically clipped to your finger. However, it is important to consult a healthcare provider to determine the need for monitoring and to interpret the results.
