What does a cylinder labeled 'Oxygen, Compressed USP' contain?

The designation 'Oxygen, Compressed USP' indicates that the oxygen contained within the cylinder meets the purity standards established by the United States Pharmacopeia (USP). The USP sets rigorous standards for the quality, purity, and strength of medical substances, ensuring that the oxygen is suitable for medical use, such as in hospitals and clinical settings.

It's important to note that while the FDA also regulates medical gases, the specific labeling and standards referenced by 'USP' are directly linked to the requirements for pharmaceutical products, emphasizing the quality assurance for medical oxygen. Understanding this distinction helps ensure that medical professionals can confidently use these gases for patient care, knowing they meet established safety and efficacy standards.