Enter a pulse oximeter reading to see how it maps onto the standard saturation bands used in clinical guidance.
SpO2
— %
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- Risk spectrum with your position marked
- Reference ranges from the original publication
- Shareable link, nothing stored
Scientific references
What the number means
SpO2 is the percentage of hemoglobin carrying oxygen. Healthy lungs keep it at 95 percent or higher at sea level. Readings of 90 to 94 percent are borderline, and under 90 percent is a medical concern.
Reading your oximeter well
- Warm hands, remove nail polish, keep still
- Wait for a stable reading over thirty seconds
- Take the reading sitting at rest, not after stairs
Understanding your result
- 95 to 100 percent is normal
- 90 to 94 percent deserves repeat checks and symptom review
- Below 90 percent warrants prompt medical assessment
Important exceptions
People with chronic lung disease may live safely at 88 to 92 percent on purpose. High altitude also lowers normal values.