- QIHC is 50 questions, 90 minutes, closed-book, delivered on your own computer through ASCP's online platform - no test center.
- Passing requires a scaled score of 400 on the 100-999 scale; the fee is $260, nonrefundable.
- Staining (30-40%) and Detection Systems (20-25%) together make up more than half the exam.
- The 2025 ASCP report shows a 62% overall pass rate (75/121), with first-time and repeat takers scoring nearly identically.
Quick Facts Snapshot
This page is designed to be the one-screen reference you pull up the night before your QIHC certification exam or during a five-minute break at the bench. It doesn't replace deep preparation - for that, work through the full QIHC Study Guide 2026 - but it condenses the mechanics, numbers, and domain weights into a format you can scan repeatedly.
| Item | Detail |
|---|---|
| Certifying body | ASCP Board of Certification (ASCP BOC) |
| Delivery method | Online qualification-examination platform, self-administered on your own computer |
| Application/exam fee | $260, nonrefundable |
| Question count | 50 multiple-choice, four-option, one-best-answer |
| Time limit | 90 minutes |
| Format | Non-adaptive, closed-book |
| Passing score | Scaled score of 400 (scale runs 100-999) |
| Credential validity | 3 years |
| Renewal requirement | 8 CMP points plus $65 fee |
| Topic outline version | Revised January 22, 2026 |
Domain Breakdown at a Glance
QIHC content is organized into five domains, and the weighting is not evenly distributed. Two domains - Staining and Detection Systems - account for well over half the exam by themselves. If you only have time to memorize one table before test day, memorize this one. For the full topic-by-topic breakdown, see the QIHC Exam Domains 2026 Complete Guide.
Domain 1: Detection Systems (20-25%)
Covers the chemistry that turns antibody binding into a visible signal.
- Direct vs. indirect detection methods
- Polymer-based and avidin-biotin systems
- Chromogens, enzyme labels, and signal amplification
Domain 2: Specimen Handling (10-15%)
Focuses on pre-analytic variables that affect antigen preservation.
- Fixation type, time, and its effect on staining quality
- Tissue processing and sectioning considerations
- Cold ischemia time and specimen integrity
Domain 3: Epitope Enhancement / Antigen Retrieval (10-15%)
Tests understanding of why and how epitopes are unmasked before staining.
- Heat-induced epitope retrieval (HIER) parameters
- Enzymatic (proteolytic) retrieval methods
- Buffer pH and its effect on retrieval efficiency
Domain 4: Staining (30-40%)
The single largest domain - expect the deepest, most detailed questions here.
- Antibody selection, titration, and validation
- Positive and negative controls, including internal controls
- Troubleshooting weak, absent, or background staining
Domain 5: Laboratory Operations (15-20%)
Covers the quality-management side of the IHC lab.
- Quality control and quality assurance procedures
- Documentation, competency assessment, and proficiency testing
- Safety and regulatory considerations in the IHC lab
Key Takeaway
Because Staining alone can represent up to 40% of the exam, budget your review time proportionally - not equally - across the five domains.
Eligibility Routes Recap
Before you even register, confirm which of the four eligibility pathways applies to you. All four require qualifying experience earned within the preceding five years, and education or experience must be documented under ASCP's laboratory-acceptability rules. For a full explanation of each pathway, see QIHC Requirements 2026: Eligibility, Prerequisites & How to Qualify.
- Route A: Valid HT/HTL (ASCP/ASCPi) certification plus six months of IHC experience.
- Route B: Valid ASCP/ASCPi scientist or specialist certification plus six months of routine histotechnology and six months of IHC experience.
- Route C: Valid MLT (ASCP/ASCPi) certification plus six months of histotechnology and 12 months of IHC experience.
- Route D: A bachelor's degree or higher plus nine months of histotechnology and 15 months of IHC experience.
Once your application is approved, you don't schedule a specific date the way you would for a proctored center - you test yourself within your approved eligibility period. Details on timing windows are covered in QIHC Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Exam-Day Mechanics
The QIHC exam format rewards familiarity with its mechanics as much as content mastery. Keep these facts locked in:
- 50 questions, all four-option, one-best-answer multiple choice.
- 90-minute time limit - roughly 1.8 minutes per question on average.
- Non-adaptive: every candidate sees a fixed-length exam, so pacing math stays consistent throughout.
- Closed-book: no textbooks, notes, reference cards, or outside assistance are permitted during the session.
- Delivered on your own computer through ASCP's online qualification-examination platform rather than a Pearson VUE test center.
Scoring and Pass Rate Recap
QIHC uses a scaled score, not a raw percentage. The scale runs from 100 to 999, and you need a 400 to pass. Because the exam is non-adaptive, the scaling accounts for item difficulty behind the scenes - you won't see your raw number of correct answers reflected directly.
ASCP's 2025 report puts the overall QIHC pass rate at 62%, based on 75 passes out of 121 attempts. Breaking that down further: first-time candidates passed at 48/78 (62%), and repeat candidates passed at 27/43 (63%) - nearly identical outcomes for first attempts and retakes. For a deeper statistical breakdown, read the QIHC Pass Rate 2026: What the Data Shows and, for a broader difficulty context, How Hard Is the QIHC Exam? Complete Difficulty Guide 2026. The exact score mechanics are explained in QIHC Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Repeat candidates pass at almost the same rate as first-timers - a failed attempt is not a predictor of a second failure if you address the gaps.
Renewal and CMP Recap
QIHC certification is valid for three years. To renew, you need eight Continuing Medical Education/CMP points distributed as follows:
- 3 points in IHC-specific content
- 1 point in laboratory/patient safety
- 1 point in medical ethics
- 3 points in related laboratory management/education topics
Renewal also carries a $65 fee. For the full cost picture across the initial application, testing, and renewal cycle, see QIHC Certification Cost 2026: Complete Pricing Breakdown. If you're still deciding whether the credential is worth pursuing given the cost and time investment, Is the QIHC Certification Worth It? Complete ROI Analysis 2026 walks through the trade-offs, and QIHC Salary Guide 2026: Complete Earnings Analysis covers earning considerations.
Last-Week Review Plan
If you're using this cheat sheet in the final stretch before testing, structure your remaining days around domain weight rather than reviewing everything equally. This is the one place we'll apply a study framework - and it's built specifically around QIHC's percentages, not generic advice.
Staining (30-40%)
- Drill antibody titration, control tissue selection, and troubleshooting scenarios
- Review causes of false-positive and false-negative staining
Detection Systems (20-25%)
- Compare polymer-based vs. avidin-biotin detection chemistry
- Memorize chromogen properties and when each is used
Laboratory Operations (15-20%)
- Review QC/QA documentation requirements and proficiency testing rules
Specimen Handling & Epitope Enhancement (10-15% each)
- Pair these two domains since both concern pre-analytic and retrieval variables
- Review fixation timing and HIER buffer pH effects together
Mixed Timed Review
- Take full-length timed practice sets at ../ to rehearse the 90-minute, 50-question pacing
- Revisit any domain where your recall felt shaky
This condensed schedule assumes you've already done foundational study using the methodology in the QIHC Study Guide 2026. The cheat sheet works best as a review layer on top of that groundwork, not a replacement for it.
Common Last-Minute Mistakes
Candidates who fall short on QIHC often make the same handful of avoidable errors in the final days before testing:
- Treating all domains equally. Spending the same review time on Epitope Enhancement (10-15%) as on Staining (30-40%) leaves the highest-weighted domain under-prepared.
- Forgetting the closed-book rule. Because the exam is closed-book with no assistance permitted, any study habit that leans on reference lookups during practice needs to be phased out before test day.
- Ignoring pacing under the 90-minute limit. Since the exam is non-adaptive, every question counts the same toward your total - don't burn excessive time on any single item.
- Studying an outdated outline. The topic outline was revised January 22, 2026; make sure your materials reflect the current version.
- Overlooking eligibility documentation. Experience must fall within the preceding five years and meet ASCP's laboratory-acceptability rules - confirm this well before your application, not during your review week.
For readers who landed here still sorting out basic terminology, it's worth backing up to What Is QIHC?, QIHC Meaning, or What Does QIHC Stand For? before diving into domain-level review - this cheat sheet assumes you already know what the credential is and are focused on passing it. If you want a one-paragraph refresher instead, What Is A QIHC?, What Does QIHC Mean?, and What Is QIHC Certification? each cover the basics from a slightly different angle.
FAQ
It is non-adaptive. Every candidate answers the same 50 four-option, one-best-answer questions within the 90-minute limit, so pacing strategy stays consistent from start to finish.
No. QIHC is delivered through ASCP's online qualification-examination platform on your own computer, rather than through a Pearson VUE test-center appointment.
You need a scaled score of 400 on ASCP's 100-999 scale. See QIHC Passing Score 2026 for a full breakdown of how scaling works.
Staining, at 30-40% of the exam, carries the most weight by far, followed by Detection Systems at 20-25%. Prioritize these two before moving to the smaller domains.
QIHC certification is valid for three years. Renewal requires eight CMP points (three IHC, one lab/patient safety, one medical ethics, three related lab/management/education) plus a $65 fee.