- What TMC Practice Questions Actually Look Like
- How the 160-Question Exam Is Divided
- Domain 1 Question Types: Patient Data Evaluation
- Domain 2 Question Types: Troubleshooting and Quality Control
- Domain 3 Question Types: Interventions (The Big 50%)
- CRT vs. RRT Cut Scores and Why They Change Your Strategy
- A Domain-Weighted Practice Schedule That Mirrors the Real Exam
- Five Costly Mistakes Candidates Make With Practice Questions
- Exam Registration, Fees, and Logistics to Know Before Test Day
- Frequently Asked Questions
- The TMC has 160 total questions-140 scored, 20 unscored pretest-across 3 hours at PSI assessment centers or approved remote proctoring.
- Domain 3 (Initiation and Modification of Interventions) is 50% of the exam; it deserves the majority of your practice time.
- Two separate cut scores exist: one for CRT eligibility and a higher one for RRT/CSE eligibility-your goal determines your target score.
- The current NBRC TMC Content Outline is valid through December 31, 2026; a new Respiratory Therapy Examination replaces it starting January 1, 2027.
What TMC Practice Questions Actually Look Like
Walk into a PSI testing center expecting a very specific kind of cognitive challenge. Every question on the Therapist Multiple-Choice Examination (TMC) is a four-option multiple-choice item, and the National Board for Respiratory Care (NBRC) writes them to test applied clinical judgment-not simple recall. You will rarely see a question that asks "What is the normal PaO₂?" in isolation. More often, you will be given a patient scenario with arterial blood gas values, ventilator settings, and a clinical context, then asked what the therapist should do next.
That distinction matters enormously when you choose practice questions. Low-quality question banks drill definitions. High-quality banks-like the ones available at TMC Exam Prep-replicate the scenario-based structure the NBRC actually uses. If your practice sessions feel easy because you already know the vocabulary, that is a warning sign, not a green light.
Questions pull directly from the NBRC's detailed content outline, which is organized into three domains. Understanding exactly how that outline translates to question format-and which topics appear most heavily-is the foundation of any serious preparation strategy. For a broader look at difficulty and scoring, see How Hard Is the TMC Exam? Complete Difficulty Guide 2026.
How the 160-Question Exam Is Divided
The NBRC publishes exact domain weightings, and those numbers should drive every hour you spend with practice questions. Here is how the scored questions break down:
| Domain | Weight | Approx. Scored Questions | Core Focus |
|---|---|---|---|
| Domain 1: Patient Data Evaluation and Recommendations | 36% | ~50 questions | Interpreting labs, imaging, patient history, and recommending care |
| Domain 2: Troubleshooting and Quality Control of Equipment and Infection Control | 14% | ~20 questions | Equipment malfunction, ventilator alarms, quality assurance, infection prevention |
| Domain 3: Initiation and Modification of Interventions | 50% | ~70 questions | Airway management, mechanical ventilation, pharmacology, therapeutic procedures |
These percentages are not estimates-they are directly published by the NBRC for the content outline effective through December 31, 2026. If you are spending equal time on each domain, you are over-investing in Domain 2 and under-investing in Domain 3. For a complete domain-by-domain breakdown, the TMC Exam Domains 2026: Complete Guide to All 3 Content Areas goes deep on every subtopic within each area.
Domain 1 Question Types: Patient Data Evaluation
Domain 1 accounts for 36% of your score and tests whether you can gather, interpret, and act on patient data correctly. At about 50 scored questions, this is the second-largest domain-and it is where many candidates lose preventable points because the questions look clinical but actually test systematic reasoning.
Domain 1: Patient Data Evaluation and Recommendations (36%)
Candidates must interpret diagnostic information and translate findings into appropriate clinical recommendations without overreaching into unsupported conclusions.
- Arterial blood gas interpretation (pH, PaCO₂, PaO₂, HCO₃⁻, base excess) and identifying acid-base disturbances
- Pulmonary function test values-recognizing obstructive vs. restrictive patterns from spirometry data
- Chest X-ray findings: recognizing pneumothorax, consolidation, hyperinflation, and pleural effusion from descriptions
- Hemodynamic data: understanding what CVP, PCWP, and cardiac output values indicate clinically
- Patient history flags: identifying contraindications, risk factors for respiratory failure, and COPD exacerbation triggers
- Neonatal and pediatric data interpretation, which appears frequently in the NBRC outline
A typical Domain 1 question might present a 68-year-old post-surgical patient with a pH of 7.32, PaCO₂ of 52 mmHg, and HCO₃⁻ of 26 mEq/L, then ask what the therapist should recommend. The correct answer requires you to recognize uncompensated respiratory acidosis and know the appropriate clinical response-not just label the ABG. See the TMC Domain 1: Patient Data Evaluation and Recommendations (36%) - Complete Study Guide 2026 for a full subtopic inventory.
Domain 2 Question Types: Troubleshooting and Quality Control
At 14%, Domain 2 is the smallest slice of the exam, but it punches above its weight in terms of how memorizable it is. These questions reward candidates who understand the mechanics of respiratory therapy equipment and the protocols that govern its safe use.
Domain 2: Troubleshooting and Quality Control of Equipment and Infection Control (14%)
These questions test practical equipment knowledge and procedural compliance, including recognizing malfunction and applying infection prevention standards.
- Ventilator alarm troubleshooting: high-pressure alarms (obstruction, coughing, secretions), low-pressure alarms (circuit disconnect, leak)
- Oxygen delivery device calibration and quality control procedures for blood gas analyzers
- Infection control: levels of disinfection, sterilization methods, standard vs. transmission-based precautions
- Equipment malfunction recognition: flowmeter inaccuracies, nebulizer output issues, pulse oximetry interference
- Spirometry quality control: acceptability and repeatability criteria per ATS/ERS standards
Because this domain is contained and rule-based, many candidates can improve their Domain 2 accuracy quickly with focused practice. Don't neglect it, but also don't let it steal study hours from Domain 3. For a focused review, check out TMC Domain 2: Troubleshooting and Quality Control of Equipment and Infection Control (14%) - Complete Study Guide 2026.
Domain 3 Question Types: Interventions (The Big 50%)
Half of your exam is Domain 3. There is no realistic path to passing the TMC without performing well here. Domain 3 questions are the most scenario-heavy on the entire exam-they demand that you not only know the correct intervention but also understand when to initiate it, how to modify it based on patient response, and when to discontinue it.
Domain 3: Initiation and Modification of Interventions (50%)
The largest domain spans virtually every therapeutic modality in respiratory care. Questions focus on decision-making under clinical conditions, not textbook definitions.
- Mechanical ventilation: initial settings, mode selection (volume control, pressure control, SIMV, CPAP/BiPAP), weaning criteria, and extubation readiness
- Airway management: intubation, tracheostomy care, suctioning, cuff management, confirmation of tube placement
- Oxygen therapy: device selection based on FiO₂ requirements, HFNC initiation and titration
- Pharmacology: bronchodilators, corticosteroids, mucolytics-dose, route, and therapeutic response evaluation
- Pulmonary rehabilitation: breathing exercises, postural drainage, chest physiotherapy
- Neonatal respiratory care: surfactant administration, CPAP in the NICU, management of RDS and BPD
- Emergency procedures: bag-mask ventilation, CPR support, emergency airway management
Key Takeaway
If you score at the 50th percentile in Domain 3 but excel in Domains 1 and 2, you will almost certainly fail the TMC. Your practice question sessions should mirror the exam's weighting: roughly half of every study block should involve Domain 3 scenarios. Visit TMC Domain 3: Initiation and Modification of Interventions (50%) - Complete Study Guide 2026 for a complete subtopic roadmap.
CRT vs. RRT Cut Scores and Why They Change Your Strategy
The TMC uses two separate cut scores on the same 140-question scored exam. The lower cut score determines eligibility for the Certified Respiratory Therapist (CRT) credential. The higher cut score-on the same sitting-determines eligibility to take the Clinical Simulation Examination (CSE) and ultimately earn the Registered Respiratory Therapist (RRT) credential.
This architecture means your goal fundamentally changes your practice question strategy. A candidate aiming only for CRT needs a strong overall baseline. A candidate targeting RRT eligibility needs to demonstrate mastery across all three domains, with particular depth in the most complex Domain 3 scenarios. The CSE then follows separately.
Knowing your target credential before you begin practice is not optional-it determines the performance ceiling you are training toward. For context on how candidate performance has tracked historically, TMC Pass Rate 2026: What the Data Shows provides a data-driven perspective.
A Domain-Weighted Practice Schedule That Mirrors the Real Exam
Generic study plans tell you to study a little every day. A TMC-specific plan tells you what to study every day and why the sequencing matters. The schedule below assumes a six-week runway and builds domain coverage proportionally.
Domain 2 Foundation + Domain 1 ABG Mastery
- Complete all Domain 2 subtopics first-it's rule-based and builds confidence early
- Drill ABG interpretation until you can classify any blood gas in under 20 seconds
- Target: 40 practice questions per day, split 50/50 between Domains 1 and 2
Domain 1 Deep Dive: PFTs, Imaging, Hemodynamics
- Work through pulmonary function test interpretation scenarios systematically
- Practice identifying chest X-ray patterns from written descriptions in question stems
- Target: 50 questions per day weighted heavily toward Domain 1
Domain 3 Phase 1: Ventilator Management and Airway
- Mechanical ventilation is the single most tested topic on the entire exam-spend two full days on initial settings alone
- Practice weaning protocol questions using rapid shallow breathing index (RSBI), NIF, and P/F ratio thresholds
- Add airway management scenarios including cuff leak, unplanned extubation, and tube confirmation
- Target: 60 questions per day, 80% from Domain 3
Domain 3 Phase 2: Pharmacology, Neonatal, and Emergency
- Cover bronchodilator pharmacology including onset, duration, and adverse effects for major drug classes
- Neonatal scenarios (RDS, BPD, surfactant, neonatal CPAP) appear regularly and trip up adult-focused candidates
- Emergency airway management and CPR support scenarios
Full Mixed-Domain Simulations
- Simulate full 140-question timed sessions under real test conditions
- Review every incorrect answer by domain to identify remaining weak spots
- Read TMC Exam Day Tips: 15 Strategies to Maximize Your Score and finalize logistics
For a comprehensive study framework that extends beyond question practice into content review, the TMC Study Guide 2026: How to Pass on Your First Attempt pairs well with this schedule.
Five Costly Mistakes Candidates Make With Practice Questions
1. Treating Every Domain Equally
Spending equal hours on Domains 1, 2, and 3 ignores the NBRC's own published weightings. Domain 3 is 50% of your exam. If your practice sessions don't reflect that, your score won't either.
2. Reviewing Only Wrong Answers
If you answered a question correctly but were not sure why, that question is nearly as dangerous as one you got wrong. Review the rationale for every answer, right or wrong. The NBRC tests the same concepts through multiple framings, and understanding the reasoning-not just the answer-prevents you from being fooled by a differently worded scenario.
3. Using Non-NBRC-Aligned Question Banks
The NBRC content outline effective through December 31, 2026 is specific. Practice banks that don't align to the current detailed content outline may test outdated material or skip high-yield subtopics entirely. Use resources explicitly built around the current outline. The free practice tests at TMC Exam Prep are designed to align with exactly this framework.
4. Ignoring Neonatal and Pediatric Content
Many candidates with primarily adult clinical experience deprioritize neonatal questions in practice. The NBRC content outline includes neonatal and pediatric respiratory care explicitly, and those scenarios appear in both Domain 1 and Domain 3. Treat them as required content, not optional reading.
5. Practicing Without Timing Pressure
At 3 hours for 160 questions, you have roughly 67 seconds per item. Candidates who practice untimed consistently find themselves rushing at the end of the real exam, making careless errors on questions they know. Build timed blocks into your practice from week three onward.
Exam Registration, Fees, and Logistics to Know Before Test Day
Practice questions are most valuable when you have a real exam date on the calendar. The NBRC administers the TMC through PSI assessment centers and through eligible remote proctoring. The exam fee is $190 for new applicants and $150 for repeat applicants. Prerequisites include being at least 18 years old and meeting NBRC education pathways-specifically, graduation from a CoARC-accredited respiratory therapy entry program with an associate degree or higher.
Once you hold a credential, maintenance comes through the NBRC Continuing Competency Program: every five years, you must complete 30 continuing education hours, retest, or earn a new credential, plus meet annual fee requirements. For a full breakdown of all associated costs, TMC Certification Cost 2026: Complete Pricing Breakdown covers every expense category from application through renewal.
For candidates weighing whether the time and cost investment makes sense, Is the TMC Certification Worth It? Complete ROI Analysis 2026 provides a structured framework for evaluating the credential's career value.
Frequently Asked Questions
The TMC contains 160 total multiple-choice questions: 140 are scored and 20 are unscored pretest items. You have 3 hours to complete the exam, administered at PSI assessment centers or through approved remote proctoring.
Domain 3 (Initiation and Modification of Interventions) at 50% of the exam should receive the largest share of your practice time. Approximately half of every study session should involve Domain 3 scenarios. Domain 1 (36%) comes next, followed by Domain 2 (14%).
Both scores come from the same 140 scored questions. The lower cut score qualifies you for the CRT credential. The higher cut score qualifies you to sit for the Clinical Simulation Examination (CSE), which is required for the RRT credential. The NBRC sets these cut scores; your goal credential should determine the performance level you train toward.
Yes. The NBRC content outline explicitly includes neonatal and pediatric respiratory care across multiple domains, particularly in Domain 1 (patient data interpretation) and Domain 3 (interventions such as CPAP, surfactant administration, and neonatal ventilation). Candidates with exclusively adult clinical experience should allocate specific practice time to these scenarios.
The current NBRC TMC detailed content outline is the version valid through December 31, 2026. Beginning January 1, 2027, the NBRC replaces the TMC and CSE pathway with a new Respiratory Therapy Examination. If you are testing in 2026, study the current outline. Always verify the effective content outline on the NBRC website before purchasing study materials.
Ready to Start Practicing?
Put your domain knowledge to the test with practice questions built around the current NBRC TMC content outline. Timed, scenario-based, and weighted to match the real exam's 50/36/14 domain split-start free today.
Start Free Practice Test