Blood Oxygen

| SLEEPON | | 41 Comments
Blood oxygen level refers to the percentage of red blood cells carrying oxygen in the blood, typically represented by the term oxygen saturation (SpO2). Oxygen saturation indicates the proportion of oxygen in the blood compared to its total oxygen-carrying capacity.
Under normal circumstances, the resting blood oxygen saturation for adults generally ranges between 95% to 100%. This indicates that the majority of red blood cells in the blood are carrying oxygen. Blood oxygen levels are influenced by various factors, including lung function, respiratory health, altitude, and cardiovascular conditions.
Certain health issues or diseases may cause a decrease in blood oxygen levels. Low blood oxygen levels can lead to symptoms such as fatigue, shortness of breath, dizziness, confusion, and cyanosis (bluish discoloration of the skin). In high-altitude areas where oxygen is scarce, individuals may experience altitude sickness, including symptoms like headaches, nausea, and rapid breathing.
In some cases, low blood oxygen levels may require medical intervention. Understanding blood oxygen levels is crucial for maintaining overall health. Regular monitoring of blood oxygen levels can help detect potential health issues and prompt timely medical intervention.


Potential Health Issues Indicated by Different Blood Oxygen Levels

Different blood oxygen levels may indicate various health issues. Here are some general standards, but individual variations, age, health conditions, and other factors can influence these values:

1. Normal Range:

  • Oxygen Saturation (SpO2): In normal conditions, the resting blood oxygen saturation for adults is typically between 95% and 100%.

2. Low Blood Oxygen Levels (Below Normal Range):

  • Mild Hypoxemia: 90% – 94%
  • Moderate Hypoxemia: 86% – 89%
  • Severe Hypoxemia: Below 86%

3. High Blood Oxygen Levels (Above Normal Range):

  • Mild Hyperoxemia: 100% – 103%
  • Moderate Hyperoxemia: 104% – 109%
  • Severe Hyperoxemia: 110% and above
These standards might vary depending on the medical equipment used, and healthcare professionals generally consider the patient’s overall health rather than solely relying on blood oxygen levels. Additionally, specific circumstances, such as chronic illnesses or special populations (e.g., newborns, elderly individuals), may have different reference ranges.
In any case, if there’s suspicion of abnormal blood oxygen levels, it’s advisable to consult healthcare professionals promptly for a detailed assessment and diagnosis. Doctors can determine, based on the patient’s specific situation, whether further examinations and treatments are necessary.


Different standards may indicate health problems:

1.Low blood oxygen levels (below the normal range)

    1. Lung issues: Low blood oxygen levels may be caused by lung problems such as chronic obstructive pulmonary disease (COPD), pneumonia, or pulmonary fibrosis.
    2. Heart problems: Impaired heart function may reduce the ability to transport oxygen in the blood, leading to low blood oxygen. Conditions like heart failure, heart valve issues, or cardiac ischemia may be the cause.
    3. Anemia: Anemia reduces the blood’s ability to carry oxygen and can lead to low blood oxygen levels. Anemia may result from factors such as nutritional deficiencies, chronic diseases, or other blood disorders.

2. High blood oxygen levels (above the normal range)

  • Hypoventilation: If the respiratory system cannot adjust and leads to excess ventilation in the lungs, it may result in high blood oxygen levels. This could be associated with respiratory failure or certain neuromuscular diseases.
  • Chronic heart failure: In some cases, individuals with chronic heart failure may experience high blood oxygen levels, possibly due to abnormal blood flow distribution.
  • Altitude response: At high altitudes, where oxygen is scarce, high blood oxygen levels may occur. This is a normal physiological response at high altitudes but may be abnormal for those accustomed to lower altitudes.
Note that different health conditions and diseases may cause similar changes in blood oxygen levels, and these levels serve as indicators rather than definitive diagnoses. Any abnormal blood oxygen levels should be thoroughly evaluated and diagnosed by healthcare professionals.

Different Sleep Stages and Blood Oxygen Levels

Blood Oxygen Levels in Different Sleep Stages

1.Wakefulness:

Blood oxygen levels typically remain within the normal range, between 95% and 100%. During wakefulness, breathing is relatively deep to ensure an adequate supply of oxygen.

2. Non-Rapid Eye Movement (NREM):

NREM sleep is divided into three sub-stages (N1, N2, and N3).
    • N1 Stage: Light sleep, with a slight decrease in blood oxygen levels.
    • N2 Stage: Light to moderate sleep, with relatively stable blood oxygen levels.
    • N3 Stage: Deep sleep, where blood oxygen levels may stay within the normal range or slightly decrease. During deep sleep, muscles relax, and physiological repair and recovery occur.

3. Rapid Eye Movement (REM):

In the REM stage, blood oxygen levels may become more irregular.

Potential Health Issues

Monitoring blood oxygen saturation during sleep can aid in diagnosing potential health issues, especially those related to breathing and sleep quality. Here are some possible concerns:

Sleep Apnea:

Both obstructive and central sleep apnea may lead to a decrease in oxygen levels. Monitoring oxygen saturation can help detect these abnormal sleep breathing patterns.

Chronic Obstructive Pulmonary Disease (COPD):

Individuals with COPD may experience a reduction in oxygen levels during sleep, especially in cases of ventilation insufficiency caused by COPD.

Cardiovascular Issues:

Heart failure, heart valve problems, or other cardiovascular diseases may result in a nighttime decrease in blood oxygen levels.

Anemia:

Anemia can reduce the blood’s ability to carry oxygen, manifesting as nighttime low blood oxygen.

Sleep Disorders:

In addition to the mentioned diseases, low blood oxygen levels during sleep may also be associated with other sleep disorders, such as sleep-related movement disorders.
By continuously monitoring blood oxygen saturation during sleep, healthcare professionals can obtain comprehensive data to accurately diagnose sleep and respiratory issues. This monitoring is typically conducted during sleep studies or using portable sleep monitoring devices. Once potential issues are identified, doctors can develop appropriate treatment plans to improve patients’ sleep and overall quality of life.

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  • I can only support Tim Marks’s argument. I think the SleepOn device is much better to wear than any other device I know. However, the results are useless if only 1 value per minute is actually recorded. I also think the raw data is of crucial importance for the user, and it should be provided.

  • Your documentation states that the SleepOn sensor monitors SpO2 every second. But the data in the app only shows one data point per minute, as does the downloaded CSV data. This mean that short duration hypoxia events would be missed in reviewing the data.

    I have been wearing the SleepOn fingertip sensor and the WellUe Pulse Oximeter (wrist device with finger sensor). The WellUe records every 2 seconds, and the app allows review of the data after the fact ever two second. This seems to catch significantly more hypoxia events every night in the WellUe data.

    Questions:
    1. The SLeepOn every second compares SpO2 to the limit, and vibrates an alarm? Not just once per minute? Because I get almost no alarms from SleepOn vs 4-5 per night from Wellue.
    2. The SleepOn app data recorded once per minute: is this the average of each of the 60 seconds SpO2, or is this just a single point recorded every minute (which would be useless)?
    3. Why don’t you allow access to the raw data (recorded every sec)? The “once per minute” data isn’t very useful.

    The SleepOn form factor would be my favorite, but the data fidelity is very poor, so I can’t recommend it to others.

    • Did you get a response from SLEEPON in answer to your questions? I am considering a purchase, but I agree with you that once per minute is useless for analysis. Even Wellue’s averaging once in 4 seconds is questionable.

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