: You must undergo a blood gas study or pulse oximetry test to prove your oxygen saturation is below specific levels (typically 88% or lower).
The oxygen market is split into two distinct categories based on purity and regulation: can you buy oxygen for home use
: A doctor must confirm a need via an in-person exam. : You must undergo a blood gas study
: These are often sold in portable canisters (like Boost Oxygen ) and typically contain 90%–95% pure oxygen. They do not require a prescription and are intended for athletes or altitude adjustment. How to Get Prescription Oxygen can you buy oxygen for home use