ACHI CHT/CHS Certification (Certified Histocompatibility Technologist / Specialist)
CHT (Certified Histocompatibility Technologist) and CHS (Certified Histocompatibility Specialist) are professional certifications in the field of histocompatibility and immunogenetics, administered by the American College of Histocompatibility & Immunogenetics (ACHI), with the primary purpose of assessing the knowledge and skills required for histocompatibility testing . Key Differences: The core distinction between the two lies in the work experience requirement. CHT is typically oriented toward technologists with relatively less experience, while CHS requires more extensive experience and a deeper level of knowledge. CHT (Technologist): Requires at least one year of relevant full-time work experience in an approved histocompatibility laboratory (within the five years prior to application) . CHS (Specialist): Requires at least five years of relevant full-time work experience (within the ten years prior to application) . Some sources indicate that CHS eligibility typically also requires prior attainment of CHT certification and several years of experience . Exam Content and "MHC": The "MHC" you mentioned does indeed appear in the search results, but as exam content. Both CHT and CHS exam outlines include the structure, function, and differences in antigen presentation of MHC Class I and Class II molecules as part of the "General Theory and Applications" knowledge domain . Numerous practice questions directly test MHC-related knowledge points, such as: Differences between MHC Class I and Class II molecules (e.g., which chromosome they are located on, which T cells they stimulate) . How peptides binding to MHC Class I and Class II molecules differ . Other Key Information: Administrating Body: ACHI (American College of Histocompatibility & Immunogenetics) . Exam Format: Computer-based testing, offered twice annually (typically in May and November) . Exam Duration: CHT and CHS candidates are allotted 3.5 hours of testing time .
Document information
- Uploaded on
- October 17, 2026
- Number of pages
- 10
- Written in
- 2026/2027
- Type
- Exam (elaborations)
- Contains
- Questions & answers
