You may need oxygen if: Arterial partial pressure of oxygen (Pa O2) is less than or equal to 55 mm Hg (millimeters of mercury, a measure of pressure).
Arterial oxygen saturation is less than or equal to 88%.
Even with all the negative factors, such as obesity, smoking and diabetes, those who were, let's say, obese and ran had a less likely chance of dying from heart problems than those obese people who didn't run.
Consider this a tool to calculate your actual or real / true age test based on gender, weight, build, biological age, stress, sleep, cholesterol, blood pressure, smoking, CAD history, heart problems, digestive tract, Diabetes history and more.
Oxygen can also be used at home if the oxygen level in your blood is too low for long periods.
Long-term oxygen therapy should be used for at least 15 hours a day with as few interruptions as possible.
Higher flow rates usually do not help, and they can even be dangerous.
What To Think About People using oxygen should not smoke.