A normal oximeter reading, also known as SpO2 (oxygen saturation), generally falls between 95% and 100% for both adults and children. However, some nuances exist depending on age and overall health.
Normal SpO2 Levels by Age Group
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Adults and Children (under 70 years old): A reading between 95% and 100% is considered normal. Readings below 95% may indicate a need for further evaluation. [Source: MedicineNet, eMedicineHealth, OnlyMyHealth]
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Adults over 70 years old: While the ideal range remains 95-100%, slightly lower readings (around 95%) are sometimes considered acceptable due to age-related physiological changes. [Source: MedicineNet, GriswoldCare]
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Newborns and Infants: Pulse oximetry is routinely used in newborns to screen for critical congenital heart disease (CCHD). Lower-than-usual blood oxygen levels may indicate the presence of CCHD. [Source: HealthyChildren.org]
Understanding Oximeter Readings
A pulse oximeter measures the percentage of hemoglobin in your blood that is saturated with oxygen. This is crucial for assessing how well your lungs are delivering oxygen to your bloodstream.
- 95%-100%: Normal oxygen saturation.
- Below 95%: May indicate hypoxemia (low blood oxygen), warranting further investigation. Causes can range from respiratory illnesses to heart conditions. [Source: MedicineNet, England NHS]
- Below 67%: Indicates severe hypoxemia, often associated with cyanosis (bluish discoloration of the skin). This is a medical emergency. [Source: MedicineNet]
- 80-85%: Indicates that the brain may be affected by low oxygen levels. [Source: MedicineNet]
Important Note: An oximeter reading is just one piece of information. A doctor should interpret the reading in conjunction with other clinical findings, symptoms, and medical history.
