RRT Exam Domains 2026: Complete Guide to All 6 Content Areas

Why Six Domains Is Really Two Exams

If you have seen "6 content areas" attached to the Registered Respiratory Therapist credential, it helps to be precise about what that means. The National Board for Respiratory Care (NBRC) publishes two separate detailed content outlines for the current RRT route: one for the Therapist Multiple-Choice Examination (TMC) and one for the Clinical Simulation Examination (CSE). Each outline has three exam-objective headings. Six is simply the count of headings across both assessments. It is not an official combined six-domain RRT blueprint, and no combined domain percentages exist.

That distinction matters for how you study. The same topic names appear on both exams, but the question style is completely different. On the TMC you answer discrete multiple-choice items. On the CSE you work through branching patient scenarios in which your choices shape what happens next. If you are new to the credential, our overview of what RRT certification is explains where the registry credential fits in the profession, and the RRT study guide covers overall preparation strategy.

The Three TMC Domains

The TMC contains 160 multiple-choice questions: 140 scored and 20 pretest items that do not count toward your result. You have three hours, and break time counts against that clock. The detailed content outline (effective January 2020 through December 31, 2026) organizes the scored items under three headings:

1. Domain 1: Patient Data (50 scored items)
2. Domain 2: Troubleshooting and Quality Control of Devices, and Infection Control (20 scored items)
3. Domain 3: Initiation and Modification of Interventions (70 scored items)

Interventions holds the largest allocation, which means half of your scored items test what you would start, adjust, or stop at the bedside. Patient Data is the second largest block, and Troubleshooting is the smallest but still worth 20 scored items. We deliberately avoid converting these counts into percentages because the issuer publishes item counts, and the pretest items are unscored and unidentified during your exam.

The Three CSE Domains

The CSE contains 22 interactive clinical-simulation problems: 20 scored and two pretest. You have four hours. Each problem can contain multiple sections and multiple choices, and the outline (effective January 2020 through December 31, 2027) uses three headings that mirror the TMC:

1. Domain 4: Patient Data
2. Domain 5: Troubleshooting and Quality Control of Equipment, and Infection Control
3. Domain 6: Initiation and Modification of Interventions

Notice the wording difference in Domain 5: the TMC heading says "Devices" while the CSE heading says "Equipment." That difference is intentional in the official outlines, so do not treat it as an error when you study. The 2026 Candidate Handbook specifies a single CSE score summed across the entire examination. There are no separate pass thresholds for information gathering and decision making, so a strong performance in one area can offset a weaker one in the overall sum, though you should not rely on that.

TMC vs. CSE Side by Side

A standard first attempt at both examinations totals USD 390, or USD 350 with the one-time USD 40 first-CSE discount available to eligible AARC members who use the prescribed application process. That excludes education, preparation, membership, and licensure. Our RRT certification cost breakdown walks through every line item.

Patient Data: What You Must Master

Patient Data appears as Domain 1 on the TMC and Domain 4 on the CSE. It covers gathering, evaluating, and interpreting information about a patient so you can decide what to do next. On the TMC, this domain carries 50 scored items. On the CSE, it shows up as the information-gathering sections of each simulation problem, where you decide which data to collect.

On the CSE, information gathering is where candidates often lose points through over-ordering or under-ordering. Choosing every available option can count against you just as skipping a critical one can. Practice asking, "What does this patient need to know right now, and what would change my plan?" For how this fits into overall difficulty, see how hard the RRT exam really is.

Troubleshooting, Quality Control, and Infection Control

This is Domain 2 on the TMC (Devices) and Domain 5 on the CSE (Equipment). It is the smallest TMC block at 20 scored items, which makes it tempting to skim. Resist that. These items tend to be concrete and answerable if you have genuinely worked with the equipment.

Infection control is part of the domain title for a reason. Expect questions about when a precaution applies and how equipment is processed between patients. A reliable approach on alarm scenarios is to assess the patient first, then the circuit, then the machine. That sequence mirrors how the exam rewards safe practice.

Initiation and Modification of Interventions

As Domain 3 on the TMC, this heading holds 70 of the 140 scored items, the single largest allocation. As Domain 6 on the CSE, it is the decision-making core of each simulation. This is where your clinical judgment gets tested directly.

The high cut score on the TMC is what opens the CSE, and the low cut leads to CRT credentialing. For a look at how candidates have fared historically, read our RRT pass rate analysis. The calendar-2025 figures there come from separate cohorts and should never be combined into a single probability.

How CSE Cases Are Assembled

The CSE draws its 20 scored problems from defined case groups. These are assembly groups for building each candidate's exam, not extra domains and not editorial weights:

• Adult Chronic Airways Disease: seven problems
• Adult Medical or Surgical: five problems
• Adult Cardiovascular: two problems
• Pediatric: two problems
• Neonatal: two problems
• Adult Trauma: one problem
• Adult Neurological or Neuromuscular: one problem

Chronic airways disease dominates the case mix, which is why COPD, asthma, and related exacerbation management deserve substantial practice time. Every case, whatever its group, still tests the same three domains: gathering data, managing equipment and infection control, and choosing interventions.

Scheduling Your Domains Across the Weeks

Rather than studying domains evenly, align your time with the TMC item counts and with how the CSE builds on TMC knowledge. Here is one RRT-specific sequence:

Interventions gets the most weeks because it carries 70 scored TMC items and drives the CSE decisions. Placing Patient Data first is deliberate: you cannot justify an intervention without reading the data. For a condensed review of the facts that recur across all three domains, the RRT cheat sheet is a useful companion, and you can test yourself on our full practice test site as you progress.

Where These Domains Sit in the 2027 Transition

The TMC/CSE structure described here is the current route, but it is changing. Under the announced transition, TMC applications close December 15, 2026, and TMC testing ends December 31, 2026. The CSE remains available through December 31, 2027, but only for the eligible transition cohort. The CRT-to-registry admission policy expires December 31, 2026.

Beginning in January 2027, a new Respiratory Therapy Examination is scheduled: 185 multiple-choice questions (160 scored, 25 pretest) over four hours, with lower and higher cut scores leading directly to CRT or RRT. Applications opened October 1, 2026, with first examination availability on January 4, 2027. That exam has its own detailed content outline, and it should be studied from its own outline rather than blended with the six TMC/CSE headings described in this article. Legacy eligibility exceptions do not automatically carry into the 2027 pathway, so check the RRT requirements guide and the exam dates page before committing to a plan.

Frequently Asked Questions