What standard dictates the levels of airborne particles in compounding areas?

The correct option, which focuses on USP standards, is relevant because the United States Pharmacopeia (USP) sets forth guidelines and standards specifically for compounding sterile preparations. USP Chapter <797> outlines the requirements for the preparation of sterile compounds, including the acceptable levels of airborne particles in compounding areas. These standards ensure that the environment in which sterile products are prepared minimizes the risk of contamination, which is critical in maintaining patient safety.

ISO standards pertain to general quality and safety across various industries, including healthcare, but USP standards are specifically detailed for pharmaceutical compounding practices. OSHA regulations focus on occupational safety and health, which while important, do not cover the specifics of compounding environments. CDC guidelines generally provide public health recommendations but do not detail the specific conditions required for sterile compounding. Hence, the emphasis on USP standards correctly identifies the authoritative source governing airborne particle levels in compounding areas.