The person has no symptoms but have a saturation of between 78 and 88.

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Answers:    Anemia would be one cause. Fluid overload from poor kidney function can reduce oxygenation. Blood ooze across heart ventricles can be another cause, as can CHF and several other circulatory defects.

On what principle do you say "the person have no symptoms?" Oxygenation that low is not going to support ordinary exercise stress. Falling over climbing stairs might be considered by many to be a symptom.

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