Ask out loud or type. Your teacher talks with you, listens, draws on the whiteboard and explains it a different way until it clicks — day or night. Free to start.
▶ Meet your teacher Take Practice Test 1 free
One-on-one ACHI teaching that adapts to you — with the patience to explain it ten different ways.
Choose from four teacher personalities with lifelike AI-generated portraits and natural US-English voices.
Premium natural voices for Pro members, and the option to teach with your own recorded voice (with your consent).
Watch HLA typing, crossmatch interpretation and virtual crossmatching explained on the board.
Concepts you can picture, tied to everyday situations you already understand.
HLA nomenclature decoders, crossmatch-interpretation tables and antibody-screen shortcuts.
Missed a question? One click sends it to your teacher, who walks you through every answer choice.
ACHI certification for histocompatibility associates, technologists and specialists (CHA, CHT, CHS) and the laboratory director examination.
CHA — Associate · CHT — Technologist · CHS — Specialist · Laboratory Director
Study ACHI examinations →Your AI teacher connects every ACHI skill to real situations — the lab, the clinic, the pharmacy and the career you’re working toward.
Illustrative AI-generated portraits. They show the look of our AI teachers and the students we build for — they are not real people, testimonials or reviews.
Warm and visual, high-energy coach, precise and Socratic, or calm storyteller.
Type or talk. “Teach me this topic,” “Why is B wrong?”, “Quiz me.”
Watch diagrams appear, hear the explanation, and answer a quick check question.
Take realistic full-length tests, review every question, and send misses back to your teacher.
Small steps from basics to ACHI-level questions.
Diagram-first teaching for visual learners.
Every idea anchored in something you already know.
Guided questions so you reason it out yourself.
Model answers and solutions explained line by line.
Hooks, patterns and recall practice.
High-yield summary, then an original practice question.
| Private human tutor | CLIABoardTests ACHI | |
|---|---|---|
| Typical cost | Often $100+ per hour | $179.99 per course for 1 year, or $69.99/month |
| Availability | Scheduled sessions | 24/7, as long as you need |
| Teaching styles | Usually one | Seven, switch any time |
| Diagrams | When they have time | Live whiteboard in every topic |
| Full-length practice | Bought separately | All full-length tests of your course included with Pro |
| Patience | Limited by the clock | Explains it again — and again |
No. Your teachers are AI-powered characters shown with AI-generated portrait images and synthetic voices, designed to teach like a patient private tutor. They’ll always tell you so if you ask.
No. Every question is original and written to match the official format of the ACHI Histocompatibility Certification Exams. We are not affiliated with or endorsed by the American College of Histocompatibility and Immunogenetics (ACHI).
No. Clinical questions, explanations and lessons are for exam preparation only — not advice for real patients.
Scores are estimates based on your answers. They’re useful for tracking progress, but no practice test can predict your official score exactly.
Yes — achitests.com is the CLIABoardTests site for the ACHI. Preparing for more than one test? See dmlitests.com (DMLI), abmggtests.com (ABMGG) or the hub for all nine boards at cliaboardtests.com.
Yes — cancel any time from your account page. You keep Pro until the end of the billing period.
Take Practice Test 1 free and start daily lessons — then unlock all the tests of your course with Pro.
▶ Start Practice Test 1 free See plansAlso preparing for DMLI or ABMGG? · All nine boards: cliaboardtests.com