In this chapter, the following documents are incorporated by reference: U.S. Pharmacopeia (USP) General Chapter 797 Pharmaceutical Compounding — Sterile Preparations (USP 797 Standards), which has been incorporated by reference in 21 U.S.C. §351(b) (as amended). U.S. Pharmacopeia (USP) General Chapter 795 Pharmaceutical Compounding — Non-Sterile Preparations (USP 795 Standards), which has been incorporated by reference in 21 U.S.C. §351(b) (as amended). U.S. Pharmacopeia (USP) Chapter 821 Radioactivity, which has been incorporated by reference in 21 U.S.C. §351(b) (as amended). U.S. Pharmacopeia (USP) Chapter 823 Radiopharmaceuticals for Positron Emission Tomography — Compounding, which has been incorporated by reference in 21 U.S.C. §351(b) (as amended).