What is composition of medical oxygen the patient receives in hospitals?

The medical oxygen that patients receive in hospitals typically has a high concentration of oxygen and is composed almost entirely of pure oxygen gas (O2). The percentage of oxygen in medical oxygen is usually between 95% and 99%, with nitrogen comprising the remaining 5% to 1%. Sometimes patients are administered 100% oxygen as well when required. To ensure the safety and effectiveness of the treatment, medical oxygen is strictly regulated and standardized by relevant healthcare organizations to meet precise specifications and quality controls.