HLA365: CHS & EFI Exam Prep

HLA365 is a study companion for histocompatibility, transplant immunology, and immunogenetics certification exams — built for laboratory scientists and healthcare professionals working in histocompatibility, molecular diagnostics, serology, blood bank, and clinical pathology laboratories around the world. Whether you're preparing for ASHI's Certified Histocompatibility Specialist (CHS) exam in the United States, an EFI accreditation exam in Europe, or another national or international histocompatibility certifying body's exam, HLA365 covers the full blueprint.

CHS EXAM PREP
Work through 39 topics spanning the full CHS exam blueprint — from immunology fundamentals and HLA nomenclature through molecular typing methods (PCR, SSP, SSO, SBT, NGS), serology and crossmatch testing, antibody detection, cell processing, solid organ and stem cell transplantation, KIR genotyping, population genetics, and lab regulatory topics. Each topic includes a quiz with three levels of explanation for every answer — a quick simple summary, a detailed technical breakdown, and key recall points to reinforce the concept.

PRACTICE EXAMS
Take randomized, full-length practice exams drawn from a bank of 1,000+ questions pulled across every topic. After each exam, review every question you missed in one place, with full explanations, so you can immediately see what to study next.

REVIEW LIBRARY
Browse general and advanced review flashcards organized by category for quick refreshers between quiz sessions.

REPORT AN ISSUE
Found a question that seems off? Flag it directly from the question screen so it can be corrected in a future update.

WORKS OFFLINE
All content is bundled with the app and all of your progress stays on your device — no account, no internet connection required, and nothing is ever uploaded anywhere.

PRICING
Try HLA365 free for 3 days. After that, a single one-time purchase of $25 unlocks the entire app for life — every topic, every practice exam, every future content update. No subscription, no recurring charges.

HLA365 is an independent study aid and is not affiliated with or endorsed by ASHI (the American Society for Histocompatibility and Immunogenetics), EFI (the European Federation for Immunogenetics), or any other histocompatibility certifying body.

Recent changes:
What's new:
- New Laboratory Safety, Biosafety & PPE topic in CHS Exam Prep, plus a matching Review section
- Review updates: pharmacogenetics and specimen handling added; immunological memory and immune tolerance folded into related topics
- Practice exams: repeated questions removed and a post-transplant DSA monitoring question added
- Various content refinements