At sea level, a low oxygen level would be an
arterialArterial embolism
Arterial insufficiency oxygen at or below 55 mm Hg, or an
arterialArterial embolism
Arterial insufficiency oxygen saturation at or below 88 percent, taken at rest, breathing room air.
If your grandmother came to Miami from a high altitude, such as Denver, she would probably not need as high an oxygen flow as she does at the higher altitude.