CHN Exam Domains 2026: Complete Guide to All 4 Content Areas

The Four-Domain Blueprint at a Glance

The Certified Hemodialysis Nurse (CHN) credential is administered by the Board of Nephrology Examiners Nursing & Technology (BONENT). Its exam outline divides the test into four content areas, and the weighting is anything but balanced. One domain accounts for nearly three-quarters of your score, and the other three share the remaining quarter. That lopsided structure should drive every decision you make about how to prepare.

A note on naming: the official PDF titles Domain 1 "Supervision/Management," while BONENT's website overview describes it as "Supervision/Administration." These refer to the same slot in the blueprint. If you see both labels in different study materials, that is the reason, and neither signals a different exam.

If you are new to the credential itself, our explainers on what CHN certification is and what CHN stands for cover the basics, including why this acronym is shared by several unrelated credentials. This guide is strictly about the hemodialysis nursing exam.

How the Exam Is Built and Delivered

Before diving into content, it helps to understand the container that content arrives in. The exam is 150 multiple-choice questions with a 3-hour limit, which works out to roughly 72 seconds per question if you spend your time evenly. BONENT does not disclose how many items are scored versus unscored, so you should treat every question as if it counts.

Scoring: scaled 70, not 70 percent

The passing standard is a scaled score of 70 on a 1-100 scale. That is not the same as getting 70% of questions right, and no source verifies a raw-score equivalent. Because BONENT does not publish a pass rate either, any figure you see quoted online deserves skepticism. For a deeper treatment, see our breakdown of the CHN passing score and our analysis of what the pass rate data does and does not show.

Delivery and rules

• Computer-based testing (CBT) runs through a linked SMT/IQT network, and paper examinations are offered under approved onsite proctoring.
• Closed book. Under the linked handbook, personal calculators and reference devices are not allowed.
• Not a verified at-home route. Do not assume you can sit the CBT version from your living room.
• Accommodations are available, but authorization and application deadlines apply, so request them early.

The no-calculator rule matters for content, too. Any dosage, ultrafiltration, or rate-related reasoning you need on test day has to be doable by hand. Practice those calculations without a device well before the exam. Wondering whether the difficulty justifies the effort? Our guide on how hard the CHN exam is weighs that honestly.

Domain 2: Dialysis and Related Issues (74.5%)

This is the exam. At 74.5%, Dialysis and Related Issues is where roughly 112 of the 150 questions would land if weighting maps proportionally to item count (BONENT does not state this, so treat it as an approximation rather than a guarantee). Whatever the exact split, a candidate who is strong here and merely adequate elsewhere is in far better shape than the reverse.

What the questions tend to reward

A multiple-choice exam for practicing nurses typically tests judgment, not recall alone. Expect scenario-style items where you must identify the most appropriate action, the first priority, or the likely cause of a patient finding. Candidates who have only memorized lists tend to struggle when two answer choices are both plausible. Build the habit of asking what the patient's current state requires right now.

Domain 1: Supervision/Management (10%)

Ten percent is not trivial. On a 150-question exam, a domain at this weight can easily decide a borderline result. The content concerns the responsibilities that come with overseeing patient care and the people delivering it.

Nurses who have never held a charge role sometimes underprepare here. If that describes you, lean on your unit's policies, your facility's organizational structure, and the official outline to understand what supervision means in a dialysis setting. This is also where experience requirements and role context intersect; see CHN requirements for how eligibility ties to ESRD work.

Domain 4: Environmental Control (10%)

Environmental Control also carries 10%, and it is the domain that clinicians most often neglect because it feels peripheral to patient care. It is not peripheral to the exam, and it is not peripheral to patient safety in a dialysis facility.

Domain 3: Professional Development (5.5%)

The smallest domain, at 5.5%, covers the professional side of nursing practice. Do not spend a proportional amount of study time here relative to Domain 2, but do not skip it either. On a 150-question exam, 5.5% is a handful of questions, and every scaled-score point matters near the passing line.

These questions are usually the quickest to answer if you have a firm grasp of nursing professionalism. They also connect to what comes after the exam: the same continuing-education habits tested here are what keep your certification active. If you are weighing the bigger career picture, read whether the CHN certification is worth it and our look at CHN jobs to see how employers value the credential.

Turning Weights into a Study Sequence

This is the one place where scheduling logic enters the discussion, and it is tied directly to the blueprint rather than to generic advice. The principle is simple: allocate time in proportion to weight, but sequence the work so the heavy domain gets repeated exposure.

No universal mandatory prep-hour total has been verified for this exam, so scale the timeline to your experience. A nurse with years of daily chairside practice may compress the clinical weeks, while someone newer to nephrology may extend them. For realistic practice, our CHN practice tests let you drill the exact question style you will face.

Registration, Fees, and Eligibility Mechanics

Knowing the domains is only half the work; you also need to get a seat at the exam. BONENT's published fee structure does not distinguish between members and non-members, which simplifies budgeting.

An optional USD 100 expedite fee is available if your timeline is tight. For the full financial picture, including renewal costs, see our CHN certification cost breakdown.

Who qualifies

The standard route requires an eligible RN license plus one year of nephrology experience, or an LPN/LVN license plus two years, along with active ESRD work and two signed references. A corresponding nurse-training pathway also exists; it requires BONENT confirmation and documentation. Because authorization and application deadlines apply, confirm your timing against current windows in our guide to CHN exam dates and deadlines.

After Passing: Validity and Renewal

The certification is valid for four years. Standard renewal requires 40 contact hours, including at least 30 in nephrology, or a qualifying examination route or once-in-lifetime waiver route. Maintenance fees are USD 65 annually or USD 240 prepaid for four years, so prepaying saves a modest amount over paying yearly.

Salary and career considerations vary by employer and region, and no single figure applies universally; our CHN salary guide explains how to evaluate earnings in context rather than chase an unverified number.

Frequently Asked Questions