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COD or Chemical Oxygen Demand definition. Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as Ammonia and nitrite.
Without more details, I'm going to treat this case as arising from chronic obstructive pulmonary disease (COPD) which is the most common cause of hypoxia. In that context, 85-90% spans very important numbers. 85% absolutely requires supplemental oxygen, whereas 90% does not. Generally oxygen is not covered by insurance and not prescribed unless the saturation is <89% (and we inpatient doctors need a result from the day of discharge and not before).