The pulse oximetry normal values are dependent on the patient`s health condition, respiratory rate, percentage of oxygen in the air, activities of the patients and other factors. Handheld Pulse Oximeter UT100. For a regular healthy human body, the normal blood oxygen saturation level (SpO2) should be around 94% to 99%.Patients who have mild respiratory diseases, the SpO2 should be 90% or above.or a regular healthy human body, the normal blood oxygen saturation level (SpO2) should be around 94% to 99%. Patients who have mild respiratory diseases, the SpO2 should be 90% or above.