- What the AMCA NAC Exam Actually Tests
- The 7 NAC Content Domains at a Glance
- Domain 1: Patient Care Skills (41%)
- Domain 2: Anatomy and Physiology (14%)
- Domain 3: Safety/Infection Control (13%)
- Domain 4: Medical Law and Ethics (13%)
- Domain 5: Medical Terminology (13%)
- Domain 6: Pharmacology (5%)
- Domain 7: EKG (1%)
- Exam Format, Registration, and Fees
- Building a Domain-Weighted Study Plan
- Who Hires NAC-Certified Professionals
- FAQ
- Patient Care Skills makes up 41% of the exam - it's nearly half your score.
- Anatomy and Physiology, Safety/Infection Control, and Medical Terminology are each worth 13-14%.
- Pharmacology (5%) and EKG (1%) are small but still appear on all 149 questions.
- You need 70% correct across 149 questions in 2 hours 45 minutes to pass.
What the AMCA NAC Exam Actually Tests
The Nursing Assistant Certification (NAC) exam, issued by the American Medical Certification Association (AMCA), is built around seven distinct content domains, each carrying its own weight on the official blueprint. Unlike a generic healthcare exam, the NAC is deliberately front-loaded toward hands-on patient care - which means candidates who focus their prep proportionally to the blueprint have a real structural advantage over those who study every topic equally.
This guide breaks down each of the seven domains in the exact proportions AMCA uses to write the 149-question exam, so you know precisely where to invest your study hours. If you haven't yet reviewed the exam's overall difficulty or scoring mechanics, it's worth reading How Hard Is the NAC Exam? Complete Difficulty Guide 2026 and NAC Passing Score 2026: Exactly What You Need to Pass alongside this domain breakdown.
The 7 NAC Content Domains at a Glance
AMCA publishes an official blueprint that assigns a fixed percentage of the exam to each domain. Here's the complete breakdown:
| Domain | Weight | Approx. Questions (of 149) |
|---|---|---|
| 1. Patient Care Skills | 41% | ~61 |
| 2. Anatomy and Physiology | 14% | ~21 |
| 3. Safety/Infection Control | 13% | ~19 |
| 4. Medical Law and Ethics | 13% | ~19 |
| 5. Medical Terminology | 13% | ~19 |
| 6. Pharmacology | 5% | ~7 |
| 7. EKG | 1% | ~1-2 |
Notice that four domains - Patient Care Skills, Anatomy and Physiology, Safety/Infection Control, and Medical Law and Ethics/Medical Terminology - account for roughly 94% of the exam. Pharmacology and EKG together make up only 6%. That imbalance should directly shape how you allocate study time, a principle we return to in the study plan section below.
Domain 1: Patient Care Skills (41%)
This is the largest domain by a wide margin, and it's where the NAC exam distinguishes itself from a purely academic test. Questions here are scenario-based: you'll be given a short patient situation and asked to identify the correct next action, technique, or documentation step.
Patient Care Skills
Candidates must demonstrate practical knowledge of direct resident/patient care as it's actually performed on a unit floor, not just textbook definitions.
- Activities of daily living (ADLs): bathing, grooming, toileting, feeding, dressing, and positioning
- Vital signs: taking, recording, and recognizing abnormal readings
- Mobility assistance: transfers, ambulation, range-of-motion exercises, use of gait belts and assistive devices
- Measuring intake/output, height, and weight accurately
- Skin care and pressure injury prevention
- Communication techniques with patients who have cognitive, sensory, or language barriers
- Restorative and rehabilitative care basics
Because this single domain accounts for roughly 61 of the 149 questions, weak performance here is very difficult to offset with strength elsewhere. If you're building or refining a study plan, this domain should receive the largest single block of hours - a point we expand on in NAC Study Guide 2026: How to Pass on Your First Attempt.
Domain 2: Anatomy and Physiology (14%)
Anatomy and Physiology
This domain tests whether you understand the "why" behind the care tasks in Domain 1 - how body systems function and what happens when they don't.
- Major body systems: cardiovascular, respiratory, musculoskeletal, nervous, digestive, urinary, integumentary
- Basic structure and function of organs relevant to daily care
- Normal aging changes and how they affect care needs
- Common signs of system dysfunction (e.g., edema, dyspnea, confusion)
Expect questions that connect a body system to a care task - for example, why a patient with limited mobility is at higher risk for a specific complication. Rote memorization of system names is not enough; you need to apply that knowledge to a scenario.
Domain 3: Safety/Infection Control (13%)
Safety/Infection Control
This domain covers the procedures that protect both patients and caregivers from harm, injury, and disease transmission.
- Standard precautions and transmission-based precautions (contact, droplet, airborne)
- Proper hand hygiene technique and timing
- Personal protective equipment (PPE): donning, doffing, and selection by exposure type
- Fall prevention and use of safety devices
- Fire, electrical, and emergency response protocols
- Body mechanics to prevent caregiver injury
Many of these questions present a specific clinical situation and ask which precaution or PPE combination applies - so memorizing isolation categories in list form isn't enough; you need to recognize them in context.
Domain 4: Medical Law and Ethics (13%)
Medical Law and Ethics
This domain assesses your understanding of the legal boundaries and ethical obligations that govern the nursing assistant role.
- Scope of practice: what a nursing assistant can and cannot legally do
- Patient rights, including privacy, dignity, and informed consent basics
- HIPAA and confidentiality requirements
- Reporting obligations for abuse, neglect, and exploitation
- Advance directives and end-of-life care basics
- Documentation standards and the legal weight of the medical record
This is also the domain most closely tied to the AMCA Code of Ethics that every candidate agrees to as part of eligibility - see NAC Requirements 2026: Eligibility, Prerequisites & How to Qualify for the full list of eligibility conditions.
Domain 5: Medical Terminology (13%)
Medical Terminology
Questions here test your ability to decode and correctly use standard medical vocabulary - the shared language used across every other domain on the exam.
- Common prefixes, suffixes, and root words
- Abbreviations used in charting and physician orders
- Directional and positional terms (e.g., supine, lateral, prone)
- Terminology specific to body systems and common conditions
Because terminology underpins how questions in every other domain are worded, weakness here can quietly cost points across the whole exam, not just within this 13% slice.
Domain 6: Pharmacology (5%)
Pharmacology
Nursing assistants don't administer most medications, so this domain focuses on awareness rather than dosing calculations.
- Common medication classifications and their general purposes
- Recognizing and reporting adverse drug reactions
- The nursing assistant's role in medication-related observation and reporting
- Basic storage and handling safety principles
Given its 5% weight - roughly seven questions - pharmacology deserves a focused review pass, but not the bulk of your prep time.
Domain 7: EKG (1%)
EKG
The smallest domain on the blueprint, covering only the most basic exposure to cardiac monitoring concepts.
- Recognizing that an EKG measures heart electrical activity
- Basic awareness of normal vs. abnormal rhythm reporting responsibilities
With only one or two questions likely drawn from this domain, a single review session is typically sufficient - don't let EKG content crowd out time needed for Patient Care Skills.
Key Takeaway
Rank your study hours by domain weight, not by personal comfort level: Patient Care Skills first, then Anatomy/Physiology, Safety/Infection Control, Medical Law and Ethics, and Medical Terminology roughly together, then Pharmacology, then EKG last.
Exam Format, Registration, and Fees
Understanding the domains is only half the picture - you also need to understand how the exam is delivered and priced. The AMCA NAC exam consists of 149 questions with a 2 hour 45 minute time limit, and a candidate needs a 70% score to pass.
The base exam fee is $119, which includes study material. Candidates can choose from three testing formats:
- Online testing - the standard format included in the base fee
- Paper-based testing - adds $25 to the base fee
- Live remote proctoring - adds $40 to the base fee
For a full cost comparison across formats and add-ons, see NAC Certification Cost 2026: Complete Pricing Breakdown. If you're still confirming eligibility before registering, NAC Requirements 2026: Eligibility, Prerequisites & How to Qualify covers the age, education, ethics-agreement, and training/experience pathways in detail, and NAC Exam Dates 2026: Testing Windows, Deadlines & Scheduling walks through scheduling logistics.
Building a Domain-Weighted Study Plan
Rather than studying topics in the order a textbook presents them, structure your prep around the blueprint percentages themselves. A domain-weighted timeline naturally puts the most exam-representative material in front of you the most often.
Patient Care Skills Foundation
- Review ADLs, vital signs, and mobility/transfer techniques
- Practice scenario-based questions specific to Domain 1
Anatomy/Physiology + Safety/Infection Control
- Map body systems to common care complications
- Drill PPE selection and precaution categories
Law, Ethics, and Terminology
- Review scope of practice, patient rights, and reporting duties
- Build a terminology reference sheet of prefixes/suffixes and abbreviations
Pharmacology, EKG, and Full Review
- Cover medication classifications and adverse-reaction reporting
- Quick EKG basics review, then a full mixed-domain practice run
This kind of weighted sequencing - spending three full weeks on the domains that make up roughly 81% of the exam before ever touching pharmacology or EKG - is more effective than a generic weekly template. For a deeper walkthrough of pacing and review techniques, see NAC Study Guide 2026: How to Pass on Your First Attempt, and for a fast final review, bookmark NAC Cheat Sheet 2026: One-Page Review of Must-Know Facts.
Running full-length timed practice sessions on our practice test platform is one of the most direct ways to feel how the 2 hour 45 minute clock interacts with 149 questions spread across seven unevenly weighted domains - a rhythm that's hard to internalize from reading alone.
Who Hires NAC-Certified Professionals
The domains tested on the NAC exam mirror the day-to-day responsibilities of the roles that typically hire NAC-certified candidates: skilled nursing facilities, assisted living communities, hospitals, home health agencies, and rehabilitation centers. Because Patient Care Skills and Safety/Infection Control dominate the blueprint, employers in these settings can be confident that a certified candidate has been tested on the exact tasks the job requires.
If you're weighing whether the certification translates into job opportunities and pay, NAC Jobs and NAC Salary Guide 2026: Complete Earnings Analysis break down the employment landscape, while Is the NAC Certification Worth It? Complete ROI Analysis 2026 weighs the time and cost investment against career outcomes. For those still researching the credential itself, What Is NAC Certification? and NAC Certification provide broader context, and NAC Training covers the preparation pathways that satisfy eligibility requirements.
Whichever path brought you here, the seven domains above are the fixed target - every question on test day, regardless of format, traces back to one of them.
Frequently Asked Questions
Start with Patient Care Skills. At 41% of the blueprint, it represents roughly 61 of the 149 questions, making it the single highest-leverage domain for improving your score.
They still appear on the exam and count toward your total score, so a light review is worthwhile. Just don't let them take time away from the higher-weighted domains like Patient Care Skills or Anatomy and Physiology.
Domains like Patient Care Skills, Safety/Infection Control, and Medical Law and Ethics lean heavily on short scenario questions that ask you to choose the correct action. Medical Terminology and Anatomy and Physiology include more direct knowledge questions alongside applied ones.
No. The same seven domains and blueprint percentages apply whether you test online, on paper, or with a live remote proctor - only the fee and delivery method differ.
Based on the blueprint percentages applied to 149 total questions, Patient Care Skills contributes roughly 61 questions, Anatomy and Physiology about 21, Safety/Infection Control and Medical Law and Ethics roughly 19 each, Medical Terminology about 19, Pharmacology around 7, and EKG only 1 to 2.