what is normal oxygen level by age
Normal oxygen level by age is usually the same for most healthy children and adults: 95% to 100% SpO2 at rest. Newborns are the main exception, since a level around 90% to 95% can be normal in the first minutes after birth before rising into the usual range.
[1][5]Quick Scoop
For most people, oxygen saturation does not change much by age, and a reading under 95% is often considered lower than normal. Some sources note that older adults may run a little lower, but below 90% is generally not normal and should be checked by a clinician.
[5][7][1]Age guide
| Age group | Typical normal SpO2 |
|---|---|
| Newborns | 90% to 95% at first, then quickly rises |
| Children | 95% to 100% |
| Teens and adults | 95% to 100% |
| Older adults | Often still 95% to 100%, though some sources note slightly lower values may be seen |
When to worry
A resting reading below 95% can be abnormal, and a reading below 90% is more concerning. If oxygen stays low or drops suddenly, it can signal a lung, heart, or circulation problem and should be medically evaluated.
[7][1][5]Bottom line: For most ages, normal blood oxygen is 95% to 100%, with newborns being the main exception.
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