- BONENT administers the CHT exam: 150 questions, three hours, scaled passing score of 70 on a 1-100 scale.
- Patient Care is 45% of the exam and Infection Control is 18% - together nearly two-thirds of all questions.
- Standard eligibility needs a high-school diploma, six months of nephrology patient-care experience, and active ESRD facility involvement.
- U.S. computer-based testing costs $255; certification lasts four years with $65 annual maintenance.
What CHT Certification Actually Is
CHT Certification, short for Certified Hemodialysis Technologist/Technician, is a credential validating that a dialysis technician has the clinical knowledge and judgment to safely support patients undergoing hemodialysis. It is not a broad "healthcare technician" badge - it is specific to the nephrology care setting, covering everything from monitoring a patient during treatment to managing dialysis machine alarms and understanding water treatment systems that feed the equipment.
If you're just starting to research the letters themselves, our companion pieces on What Is CHT?, CHT Meaning, and What Does CHT Stand For? walk through the terminology in plain language. This article goes deeper into the mechanics of the certification itself: who runs it, what it costs, how it's scored, and what a candidate needs to actually know to pass.
Who Administers the CHT Exam
The Board of Nephrology Examiners Nursing & Technology (BONENT) is the certifying body responsible for the CHT credential. BONENT offers the exam through two delivery methods: computer-based testing via the SMT/ISO-Quality Testing network, or traditional paper-and-pencil testing. Both formats are closed-book and proctored in person - personal calculators and outside reference materials are not permitted during the exam session.
Candidates who choose computer-based testing must complete their exam within six months of receiving confirmation of eligibility, so scheduling promptly after approval matters. A Spanish-language version of the exam is also available for candidates who prefer to test in Spanish.
Eligibility Pathways
BONENT built multiple eligibility routes into the CHT application process, recognizing that dialysis technicians come from different educational and professional backgrounds.
- Standard pathway: a high-school diploma or official transcript, at least six months of nephrology patient-care experience, and active participation in an ESRD facility.
- BONENT-approved program graduates: may apply within two years of program completion without needing to document the separate six-month patient-care experience requirement.
- Experience-based diploma waiver: candidates with more than four years of dialysis experience can use that experience to support a waiver of formal diploma documentation.
Every applicant also needs two signed and dated professional references - one from an immediate supervisor and one from a nephrology professional. Applicants who are currently unemployed but otherwise qualified may submit a reference from their previous supervisor instead. For a full breakdown of every pathway and documentation requirement, see CHT Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Exam Format and Scoring
The CHT exam consists of 150 multiple-choice questions administered over three hours. What surprises many first-time candidates is how scoring works: passing requires a scaled score of at least 70 on a 1-100 scale - this is not the same as answering 70% of raw questions correctly. The scaled score accounts for question difficulty across different exam forms, so two candidates who answer a different number of raw questions correctly could both land on the same scaled score.
This distinction matters enormously for how you interpret practice test performance. For a detailed explanation of exactly how the scaled score is calculated and what it means for your study targets, read CHT Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Don't treat practice-test raw percentage as your finish line. A scaled score of 70 is the actual bar, and it's calibrated differently than simple raw accuracy.
The Five CHT Exam Domains
The CHT exam is built around five content domains, each carrying a different weight. Understanding these weights should directly shape how many hours you devote to each topic area during preparation.
Domain 1: Patient Care (45%)
By far the largest domain and the true center of gravity for the exam. Candidates must understand pre-treatment assessment, vascular access care, intradialytic monitoring, complication recognition and response, and post-treatment procedures.
- Vascular access types and complication signs
- Vital sign trends during treatment and appropriate interventions
- Fluid removal calculations and dry weight concepts
Domain 2: Machine Technology (12%)
Covers the operation, troubleshooting, and safety features of hemodialysis machines, including alarm response and equipment maintenance basics.
- Alarm categories and appropriate technician response
- Blood and dialysate circuit components
Domain 3: Water Treatment (15%)
Focuses on the water purification systems required to produce safe dialysate, a topic many technicians underestimate until they see how heavily it's tested.
- Reverse osmosis and deionization principles
- Water quality testing and disinfection procedures
Domain 4: Infection Control (18%)
The second-largest domain, reflecting how central infection prevention is to dialysis patient safety given repeated vascular access and blood exposure risks.
- Standard precautions and isolation procedures specific to dialysis units
- Disinfection of equipment and surfaces between patients
Domain 5: Education and Professional Development (10%)
Covers patient education responsibilities, professional ethics, and the technician's role within the broader care team.
- Patient teaching around diet, fluid restriction, and self-care
- Scope of practice and professional communication
For a complete walkthrough of every subtopic inside each domain, see CHT Exam Domains 2026: Complete Guide to All 5 Content Areas. And if you're wondering how these weights translate into overall exam difficulty, How Hard Is the CHT Exam? Complete Difficulty Guide 2026 breaks that down further.
| Domain | Weight | Core Focus |
|---|---|---|
| Patient Care | 45% | Assessment, access care, intradialytic monitoring |
| Infection Control | 18% | Precautions, disinfection, exposure prevention |
| Water Treatment | 15% | Purification systems, water quality testing |
| Machine Technology | 12% | Equipment operation, alarms, troubleshooting |
| Education & Professional Development | 10% | Patient teaching, ethics, scope of practice |
Fees and Registration Mechanics
Understanding the fee structure helps candidates plan and avoid surprises during application. In the U.S., the exam fee is $255 for computer-based testing or $235 for paper-and-pencil. International candidates pay $255 for computer-based testing or $260 for paper-and-pencil. Candidates who want their application processed faster can pay an optional $100 expedited processing fee.
BONENT also sells an official practice examination containing 50 questions for $60, which can be a useful gauge before committing to the full exam date. A full cost breakdown, including maintenance and renewal fees layered over a multi-year period, is available in CHT Certification Cost 2026: Complete Pricing Breakdown.
Once you've reviewed the fee structure, scheduling is the next practical step - timing your application and test date is covered in CHT Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Maintaining Certification
CHT certification is valid for four years. Maintenance is billed annually at $65, or candidates can prepay $240 to cover the full four-year cycle upfront. As long as annual maintenance stays current, there is no additional routine recertification fee at renewal time.
Starting with the 2026 cycle, the continuing-education renewal route requires 40 contact hours total, with at least 30 of those classified as Group A nephrology-focused hours. Technologists who don't complete continuing education can instead choose re-examination, or use a once-in-a-lifetime continuing-education waiver if eligible. There's also a built-in remediation rule: after every third unsuccessful examination attempt, BONENT requires eight nephrology continuing-education hours before further attempts.
Who Hires CHTs
CHT-certified technicians work primarily in outpatient dialysis clinics, hospital-based dialysis units, and home dialysis training programs operated by large and independent dialysis provider networks. Because the certification is tied directly to ESRD patient care experience as an eligibility requirement, most CHTs are already working in a dialysis setting before they sit for the exam - the credential formalizes and validates skills they're actively using.
Employers value the CHT specifically because it demonstrates domain-verified competency in patient care and infection control, the two heaviest-weighted areas on the exam and also the two highest-stakes areas in daily dialysis practice. For a closer look at job titles, settings, and how certification affects hiring conversations, see CHT Jobs. If you're weighing whether pursuing certification pays off relative to the cost and study time, Is the CHT Certification Worth It? Complete ROI Analysis 2026 and CHT Salary Guide 2026: Complete Earnings Analysis address that directly.
Building a Domain-Weighted Study Plan
Generic study advice rarely accounts for the fact that CHT's domain weights are wildly uneven - Patient Care at 45% deserves far more study time than Education and Professional Development at 10%. A simple way to structure preparation is to allocate study weeks roughly proportional to domain weight, with review weeks layered at the end.
Patient Care (45%)
- Vascular access assessment and complication recognition
- Intradialytic monitoring and emergency response scenarios
Infection Control (18%)
- Standard precautions specific to dialysis units
- Equipment disinfection protocols between patients
Water Treatment (15%)
- Reverse osmosis, deionization, and water quality testing
Machine Technology & Professional Development (12% + 10%)
- Alarm troubleshooting and circuit components
- Patient education topics and scope of practice
Full Review
- Take the official 50-question practice exam
- Revisit weak domains identified from practice results
This structure isn't a rigid formula - some candidates with more clinical experience in one domain will need less time there and more in another. For a fully detailed week-by-week study system built around BONENT's content outline, see CHT Study Guide 2026: How to Pass on Your First Attempt. Practicing with realistic multiple-choice questions on our practice test platform throughout each week, rather than saving all practice until the end, helps surface weak spots early while there's still time to address them.
Key Takeaway
Spend roughly proportional time per domain weight - Patient Care and Infection Control together account for 63% of the exam, so they should dominate your study calendar.
Before test day, it's also worth reviewing how other candidates have historically performed, without over-indexing on any single number. CHT Pass Rate 2026: What the Data Shows puts exam outcomes in context so you can calibrate your own readiness realistically. And if you want a compact, last-minute review resource, CHT Cheat Sheet 2026: One-Page Review of Must-Know Facts condenses the highest-yield facts across all five domains onto a single reference page.
Frequently Asked Questions
The Board of Nephrology Examiners Nursing & Technology (BONENT) administers the CHT exam, offering both computer-based testing through the SMT/ISO-Quality Testing network and paper-and-pencil options.
The exam contains 150 multiple-choice questions, and candidates are given three hours to complete it.
You need a scaled score of at least 70 on a 1-100 scale. This is a scaled score, not a raw percentage of questions answered correctly.
Certification lasts four years. Annual maintenance costs $65 (or $240 prepaid for all four years), and the 2026 renewal route requires 40 continuing-education hours, including at least 30 Group A nephrology-focused hours, with re-examination or a once-in-a-lifetime CE waiver as alternatives.
Patient Care, at 45% of the exam, is by far the largest domain and should receive the most study time, followed by Infection Control at 18%.