- Why the 12 Content Areas Matter
- Official Domain Breakdown and Item Counts
- Domain 2: Basic Nursing Skills (The Heaviest Domain)
- Resident Rights and Safety: Domains 10 and 12
- The Other Nine Content Areas
- Exam Format, Timing, and Passing Standard
- Registration, Fees, and the Remote Option
- Mapping Study Time to Domain Weight
- Who Hires Candidates Who Pass This Exam
- Frequently Asked Questions
- The knowledge exam has 75 questions across 12 domains, each with a published, fixed item count.
- Basic Nursing Skills carries 15 questions - the single largest domain on the California exam.
- Resident Rights (8) and Safety (8) are the next-largest domains, ahead of every other content area.
- You need at least 75% correct in 60 minutes to pass the computer-delivered knowledge test.
Why the 12 Content Areas Matter
The D&SDT-Headmaster California Nurse Aide Knowledge Exam (HDMASTER-NA) isn't organized as a loosely themed test - it's built from 12 named content areas, each assigned a specific number of questions by the California Department of Public Health (CDPH) and the approved testing provider, D&S Diversified Technologies/Headmaster LLP, on the TestMaster Universe (TMU) platform. If you're building a study plan, the domains are your map. Skipping one because it "feels minor" is exactly how candidates lose points they didn't need to lose.
This guide walks through every domain using the official allocations published in the March 2026 California Candidate Handbook (version 9.0), so you know precisely how many questions come from each area - not a guess, not a percentage borrowed from a different state's version of this exam. For a broader first-attempt strategy, pair this with our HDMASTER-NA Study Guide 2026, and if you want the exact score you need to clear, see our breakdown of the HDMASTER-NA Passing Score 2026.
Official Domain Breakdown and Item Counts
The computer-delivered knowledge exam totals 75 multiple-choice questions, each with four response options, completed in a 60-minute window. Those 75 questions are distributed across the 12 domains as follows:
| Domain | Questions |
|---|---|
| Basic Nursing Skills | 15 |
| Resident Rights | 8 |
| Safety | 8 |
| Infection Control | 6 |
| Mental Health | 6 |
| Role and Responsibility | 6 |
| Care Impaired | 5 |
| Communication | 5 |
| Aging Process and Restorative Care | 4 |
| Data Collection | 4 |
| Disease Process | 4 |
| Personal Care | 4 |
Notice the pattern: one domain (Basic Nursing Skills) is dramatically larger than the rest, two more (Resident Rights and Safety) form a clear second tier, and the remaining nine domains each contribute between 4 and 6 questions. That structure should directly shape how you allocate review time.
Domain 2: Basic Nursing Skills (The Heaviest Domain)
With 15 of 75 questions, Basic Nursing Skills is worth roughly one out of every five questions on the exam - more than triple the smallest domains. If you only have time to master one content area deeply, this is it.
Basic Nursing Skills
This domain covers the hands-on procedural knowledge every California nurse aide candidate is expected to demonstrate understanding of before sitting for the knowledge test - not the physical skills themselves, which are assessed separately on the manual skills examination.
- Positioning, transferring, and body mechanics principles
- Vital signs measurement and normal ranges
- Feeding, hydration, and elimination support procedures
- Documentation and reporting expectations tied to routine care tasks
Because this domain is disproportionately large, it deserves disproportionate review time - not just re-reading definitions, but working through scenario-style questions that mimic how TMU phrases items. A generic flashcard app won't replicate the exact question style; our HDMASTER-NA Cheat Sheet 2026 distills the must-know facts for this domain into a single reviewable page.
Resident Rights and Safety: Domains 10 and 12
Tied at 8 questions each, Resident Rights and Safety form the second-most-important tier on the exam. Together they represent more questions than the bottom four domains combined.
Domain 10: Resident Rights
Candidates must understand the legal and ethical framework protecting residents in California facilities, including autonomy, privacy, and grievance processes.
- Informed consent and the right to refuse care
- Confidentiality of resident information
- Freedom from abuse, neglect, and unnecessary restraint
- Reporting obligations when rights violations are observed
Domain 12: Safety
This domain tests situational judgment around preventing harm during daily care activities in a residential or facility setting.
- Fall prevention and use of assistive/safety devices
- Fire and emergency response basics
- Body mechanics as they relate to injury prevention
- Identifying and reporting environmental hazards
Key Takeaway
Resident Rights and Safety questions often use scenario framing ("what should the aide do first?"). Practice ranking actions by priority, not just recalling facts.
The Other Nine Content Areas
The remaining nine domains each contribute between 4 and 6 questions. They're smaller individually, but collectively they still account for a large share of the 75-item exam, so none of them can be skipped.
Domain 7: Infection Control (6 questions)
Standard precautions, hand hygiene technique, PPE use, and preventing cross-contamination in a care setting.
Domain 8: Mental Health (6 questions)
Recognizing signs of depression, anxiety, confusion, and appropriate supportive responses for residents in psychological distress.
Domain 11: Role and Responsibility (6 questions)
Scope of practice boundaries, chain-of-command reporting, and what tasks fall outside a nurse aide's authorized duties.
Domain 3: Care Impaired (5 questions)
Adapting care approaches for residents with cognitive, sensory, or physical impairments, including dementia-related behaviors.
Domain 4: Communication (5 questions)
Verbal and non-verbal techniques for interacting with residents, families, and the care team, including barriers to effective communication.
Domain 1: Aging Process and Restorative Care (4 questions)
Normal physical and psychosocial changes of aging, and supporting residents in maintaining or regaining function.
Domain 5: Data Collection (4 questions)
Observing, measuring, and reporting resident status changes accurately to the licensed nursing staff.
Domain 6: Disease Process (4 questions)
Common conditions encountered in long-term care and the aide's role in supporting residents managing them.
Domain 9: Personal Care (4 questions)
Bathing, grooming, dressing, and oral hygiene assistance performed with dignity and resident preference in mind.
Exam Format, Timing, and Passing Standard
Every domain shares the same question format: multiple-choice with four response options, delivered on the TMU computer-based platform. There is no domain-by-domain time limit - the full 75-question exam runs on a single 60-minute clock, so pacing across all 12 areas matters as much as knowing the content.
The passing standard is at least 75% correct overall. That figure applies to your total score across all domains combined, not to each domain individually - so a weak showing in a small domain like Personal Care can still be offset by strong performance in Basic Nursing Skills, though relying on that strategy is risky. For the full scoring mechanics, see our dedicated page on the HDMASTER-NA Passing Score.
Registration, Fees, and the Remote Option
Domain content is only half the picture - you also need to register correctly. Effective March 1, 2026, the standard knowledge exam costs $40, the audio version of the knowledge exam costs $45, and the manual skills exam costs $100. If you need the audio format, you must select it before paying the testing fee; it can't be added afterward. Retakes are charged per failed component at these same rates.
Knowledge testing is available at physical test sites or through an approved remotely proctored option. Remote candidates need two separate devices: a testing computer or tablet, plus a second smartphone or tablet camera angled to show the candidate, the screen, the keyboard, and the mouse simultaneously. Testing must happen alone in a quiet, secured location - no other people in the room. On-site test takers may use a basic calculator and scratch paper, both supplied by the proctor, and an inspected word-for-word translation dictionary is allowed; dictionaries with handwritten notes or definitions, and any electronic translator, are prohibited.
Keep your CDPH 283B certification application separate from your TMU exam registration - they're two different systems, and your identifying details must match across both for registry processing to go through cleanly. A full cost breakdown, including how these fees interact with retakes, is available in our HDMASTER-NA Certification Cost 2026 guide.
Mapping Study Time to Domain Weight
Once you know the item counts, the smartest use of a study calendar is proportional review - spend more days on domains worth more questions, not equal time on all 12.
Basic Nursing Skills + Safety
- Drill procedural scenarios for the 15-question domain first
- Layer in Safety's fall-prevention and hazard-reporting content
Resident Rights + Infection Control + Mental Health
- Practice scenario ranking for rights violations
- Review PPE sequencing and mental health warning signs
Role and Responsibility, Care Impaired, Communication
- Focus on scope-of-practice boundary questions
- Practice dementia-care and communication scenarios
Remaining smaller domains + full simulation
- Round out Aging Process, Data Collection, Disease Process, Personal Care
- Take a full 75-question, 60-minute timed run on the practice test platform
This isn't a generic spaced-repetition template - it's built directly from the published item counts, front-loading the domains worth the most points. If you'd rather see how this fits into a complete first-attempt plan, our Study Guide 2026 covers the full sequence, and you can gauge realistic difficulty expectations in our companion guide on how hard the exam actually is.
Who Hires Candidates Who Pass This Exam
Passing all 12 domains on the knowledge exam, alongside the manual skills component, is what leads to CDPH certification as a nurse aide in California. Skilled nursing facilities, residential care homes, and other licensed long-term care settings look for this credential specifically because it confirms competency across exactly the areas outlined above - from infection control to resident rights to basic nursing procedures. For a closer look at where certified candidates typically find work, see our HDMASTER-NA Jobs overview, and start your own domain-by-domain practice today at hdmasternaexam.com.
Frequently Asked Questions
There are 12 official content areas, ranging from 4 to 15 questions each, totaling 75 questions on the computer-delivered knowledge exam.
Basic Nursing Skills has 15 questions, making it the largest domain by a wide margin. Resident Rights and Safety follow with 8 questions each.
The 75% passing standard applies to your total score across all 12 domains combined, not to each domain individually.
Yes. Nine of the 12 domains fall in the 4-6 question range, and together they make up more than half the exam, so they can't be skipped.
They're published in the March 2026 California Candidate Handbook, version 9.0, from D&S Diversified Technologies/Headmaster LLP and CDPH - not estimated or converted percentages.