What is the antigen/antibody combo (4th generation) test?
The 4th Generation HIV is the preferred testing method, recommended by the CDC. 4th Generation tests, also known as Ag/Ab tests, test for both antigen (p24) and antibodies (IgM and IgG) and are capable of detecting an HIV infection 20 days earlier than the Western Blot test. A downloadable, print-quality brochure can be downloaded here: AETC 4th Gen Brochure (PDF)
Laboratory Testing for the Diagnosis of HIV Infection
Both the full CDC guide for diagnostic HIV laboratory testing and Quick Reference guide can be downloaded below:
Quick Reference Guide (PDF)