[Code of Federal Regulations] [Title 21, Volume 7] [Revised as of April 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR610.10] [Page 67] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PART 610_GENERAL BIOLOGICAL PRODUCTS STANDARDS--Table of Contents Subpart B_General Provisions Sec. 610.10 Potency. Tests for potency shall consist of either in vitro or in vivo tests, or both, which have been specifically designed for each product so as to indicate its potency in a manner adequate to satisfy the interpretation of potency given by the definition in Sec. 600.3(s) of this chapter.