RT Journal Article SR Electronic T1 A CEA Kit with Second Antibody Procedure: Modifications to Permit Small Tube Assay JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 26 OP 27 VO 11 IS 1 A1 Cross, Daniel J. YR 1983 UL http://tech.snmjournals.org/content/11/1/26.abstract AB An improved CEA kit using a second antibody suspension to replace the Z-gel separation was recently introduced. Both the improved and the original methods require use of a counting tube greater than 13 × 100 mm, which some instruments may not be able to count. A simple technique that allows the completed assay to be counted in small tubes (12 × 75 mm) without adverse effects on the assay results is described.