[Code of Federal Regulations] [Title 21, Volume 7] [Revised as of April 1, 2001] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR610.16] [Page 69] TITLE 21--FOOD AND DRUGS 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.