[Code of Federal Regulations] [Title 21, Volume 7] [Revised as of April 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR610.16] [Page 75] 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. 610.16 Total solids in serums. Except as otherwise provided by regulation, no liquid serum or antitoxin shall contain more than 20 percent total solids.