A radioimmunoassay for the determination of 3 beta-hydroxy-5-cholenoic acid in human serum has been developed. using 3 beta-hydroxy-5-cholenoyl-thyroglobulin as immunogen and 3 beta-hydroxy-5-cholenoylglycyl-125I histamine as radioactive ligand. The association constant was 6. 3 X 10(8) l/mol. https://www.spidertattooz.com/OPI-Infinite-Shine-Combo-Base-Top-March-In-Uniform-0-5-oz-ISHRK19-p26675/