The ACHI CHA, CHS, and CHT Examinations are designed to assess the foundational and advanced knowledge required for certification as a Certified Histocompatibility Associate (CHA), Certified Histocompatibility Specialist (CHS), or Certified Histocompatibility Technologist (CHT).Examinations for the CHA, CHS, and CHT will be offered twice annually, in May and November.
Examination Application Dates & Fees Dates for the 2026 application cycle are as follows:
SPRING 2026 Examination Dates: May 1 to 31, 2026 Application Start: January 15, 2026 Application End: February 15, 2026
FALL 2026 Examination Dates: November 1 to 30, 2026 Application Start: June 15, 2026 Application End: July 15, 2026