Healthy individuals at sea level usually exhibit<unk> values between 96% and 99%, and should be above 94%. At 1,600 meters' altitude (about one mile high)<unk> should be above 92%. An SaO2 (arterial<unk>  value below 90% causes hypoxia (which can also be caused by anemia). Hypoxia due to low SaO2 is indicated by cyanosis, but<unk> does not directly reflect tissue<unk> ation. The affinity of hemoglobin to<unk>  may impair or enhance<unk>  release at the tissue level.<unk>  is more readily released to the tissues (i.e., hemoglobin has a lower affinity for<unk>  when pH is decreased, body temperature is increased, arterial partial pressure of carbon dioxide (PaCO2) is increased, and 2,3-DPG levels (a byproduct of glucose metabolism also found in stored blood products) are increased. When the hemoglobin has greater affinity for<unk> , less is available to the tissues. Conditions such as increased pH, decreased temperature, decreased PaCO2, and decreased 2,3-DPG will increase<unk>  binding to the hemoglobin and limit its release to the tissue.
Oxygen saturation 
Blood gas tension
Respiratory rate
Oxygenation index
Blood pressure
Fraction of inspired oxygen
Heart rate
Breathing gas