Yes, 98% is a good oxygen level. It falls squarely in the normal range of 95% to 100% for healthy adults, as measured by a pulse oximeter. A reading of 98% means nearly all the hemoglobin in your blood is carrying oxygen, and your lungs are doing their job well.
What the Normal Range Looks Like
Pulse oximeters display a number called SpO2, which represents the percentage of hemoglobin molecules in your blood that are loaded with oxygen. For most people, anything between 95% and 100% is normal. There’s no meaningful difference in how your body functions at 97% versus 99%. That’s because of the way oxygen binds to hemoglobin: at higher levels, the relationship between oxygen pressure in your lungs and hemoglobin saturation flattens out into a plateau. Small fluctuations in this range are completely expected throughout the day.
A reading below 95% in someone without a chronic lung condition is worth paying attention to. Below 92% is generally considered low enough to need medical evaluation. British Thoracic Society guidelines set the target range for acutely ill patients at 94% to 98%, which gives you a sense of where clinicians draw the line between “fine” and “needs oxygen support.”
When a Lower Number Is Actually Normal
Not everyone’s target is 95% to 100%. People with chronic obstructive pulmonary disease (COPD) have a different healthy range. European and British guidelines recommend a target of 88% to 92% for patients with COPD, because giving these patients too much oxygen can actually cause harm by disrupting the way their body regulates carbon dioxide. Research published in the Emergency Medicine Journal found that hospitalized COPD patients had the lowest mortality rates when their oxygen saturation stayed in that 88% to 92% window.
Other conditions that shift the target range downward include cystic fibrosis, morbid obesity, neuromuscular disorders, and chest wall deformities. If you have one of these conditions, your doctor has likely already told you what range to aim for.
How Pulse Oximeters Can Be Wrong
The number on your pulse oximeter isn’t always perfectly accurate. These devices work by shining light through your fingertip and measuring how much is absorbed by oxygenated versus deoxygenated blood. Several factors can skew the reading.
Skin pigmentation is the most studied source of error. Research from Harvard Medical School found that pulse oximeters tend to overestimate oxygen levels in Black, Hispanic, and Asian patients. When researchers compared pulse oximeter readings to actual blood oxygen measurements, patients with darker skin tones consistently showed higher SpO2 readings than their true saturation. This means a reading of 98% could, in some cases, represent a slightly lower actual value.
Cold fingers, nail polish (especially dark colors), poor circulation, and excessive movement can also throw off readings. If your hands are cold or you just came in from outside, warm up for a few minutes before checking. Place the device on your index or middle finger, sit still, and wait for the number to stabilize before reading it.
Symptoms That Matter More Than the Number
A pulse oximeter is a useful screening tool, but it doesn’t tell the whole story. Your body gives its own signals when oxygen delivery is falling short. Symptoms of low blood oxygen include shortness of breath, a rapid heart rate, headache, confusion, unusual fatigue, wheezing, and a bluish tint to the skin, lips, or fingernails. If you’re experiencing any of these, trust your body over the device. A pulse oximeter reading of 95% with significant shortness of breath is more concerning than a reading of 93% in someone who feels perfectly fine at altitude.
A drop of 3% or more from your usual baseline also warrants attention, even if the number still looks “normal.” Someone who usually reads 99% and suddenly drops to 95% is showing a meaningful change, even though 95% technically falls within the standard range.
What a Pulse Oximeter Can’t Tell You
SpO2 measures one thing: the percentage of hemoglobin that’s saturated with oxygen. It doesn’t measure how much hemoglobin you have. Someone with severe anemia could show a perfectly normal 98% reading while their blood is actually carrying far less total oxygen than it should, simply because they have fewer red blood cells to carry it. The hemoglobin they do have is fully loaded, but there isn’t enough of it.
It also can’t distinguish between oxygen and carbon monoxide. Carbon monoxide binds to hemoglobin in a way that looks identical to oxygen on a pulse oximeter, which is why someone with carbon monoxide poisoning can show a falsely reassuring SpO2 reading. A more detailed picture of blood oxygen requires an arterial blood gas test, which measures the actual pressure of dissolved oxygen in your blood along with carbon dioxide levels and pH. That test requires a blood draw from an artery and is done in clinical settings.
For everyday home monitoring, though, a pulse oximeter reading of 98% tells you exactly what you want to hear: your lungs are exchanging oxygen efficiently and your blood is well-saturated.