CNA Written Pass Rate, Format & Study Guide

Certified Nursing Assistant (CNA) certification — earned by passing a written/oral knowledge exam plus a separate hands-on skills evaluation — places a candidate on their state's official nurse aide registry, the legal requirement to work as a nursing assistant in a licensed healthcare facility in the United States. The federal framework behind this requirement traces to OBRA-87 (the Omnibus Budget Reconciliation Act of 1987), which established the 75-hour minimum training standard every state builds its own nurse aide program on top of. Because nurse aide registries are administered at the state level, the specific testing vendor (NNAAP via Credentia, Prometric, or Headmaster, depending on the state), exact question counts, and time limits genuinely vary — there is no single national CNA exam the way there is for some federally-standardized credentials.

CNAs provide the majority of hands-on, direct patient care in nursing homes, assisted living facilities, and hospitals — bathing, feeding, mobility assistance, and vital-signs monitoring — making the role foundational to the long-term care and healthcare support workforce, and one of the more accessible entry points into a healthcare career given its relatively short (75-hour minimum) training requirement compared to nursing or allied-health credentials requiring years of education. For many CNAs, the credential is also a stepping stone: it's common for CNAs to use the role as clinical-experience-building work while pursuing LPN, RN, or other advanced healthcare credentials, since state nurse aide registry status and direct patient-care experience often satisfy prerequisites for those next-step programs.

This exam is for candidates who've completed (or are completing) a state-approved nurse aide training program and are pursuing entry-level direct-care work in a licensed healthcare facility — hospitals, nursing homes, assisted living, and home health settings. It's a genuinely accessible entry point into healthcare work, requiring no prior healthcare experience beyond successful completion of the training program itself, making it a common starting point for career-changers and healthcare-career newcomers alike.

The certifying body does not publicly publish an official pass rate for this exam. Be wary of third-party sites citing a specific number here — treat any pass-rate claim you see elsewhere for this exam as unverified.

Retake policy depends on which vendor administers the exam in your state (NNAAP/Credentia, Prometric, or Headmaster all operate in different states), so wait periods and fees vary. Common across all three: the written/oral knowledge test and the hands-on skills evaluation are graded and retaken independently — passing one does not carry over if you fail the other, and most states cap the number of total attempts (commonly around 3) before requiring re-enrollment in a training program.

Every state requires OBRA-87's federal minimum of 75 hours of training (at least 16 hours supervised clinical practice) before you're eligible to test. The NNAAP written exam (administered by Credentia, which took over from NCSBN in 2024) is 70 multiple-choice questions in a 2-hour limit, of which only 60 are scored (10 are unscored pretest items not identifiable to the candidate); Prometric's version is 60 questions in 90 minutes, and Headmaster's is 75 questions in 1 hour — exact format depends on which vendor your state uses. The skills evaluation requires demonstrating 5 skills (hand-washing is always included), and missing a designated 'critical element' step within any skill fails that skill regardless of how well the rest was performed.

Format varies by which vendor administers the exam in a given state: NNAAP (administered by Credentia Nurse Aide LLC, which took over the program from NCSBN in 2024) uses 70 questions — 60 scored, 10 unscored pretest items — with a 2-hour time limit, Prometric uses 60 questions with a 90-minute time limit, and Headmaster uses 75 questions with a 1-hour time limit. Regardless of vendor, every candidate must pass both a knowledge test (written or oral) and a separate, distinct hands-on skills evaluation — passing one doesn't carry over if the candidate fails the other, and both must be passed independently to be placed on the state's nurse aide registry.

Across all three testing vendors, exam content centers on the core competencies of direct patient care: basic nursing skills (vital signs, personal care, mobility and positioning assistance), infection control and safety practices, communication and interpersonal skills with patients and care teams, resident/patient rights, and mental health/social service needs relevant to the populations CNAs typically serve (particularly in long-term care settings). The hands-on skills evaluation tests a randomly selected subset of specific care skills (bed-making, transferring a patient, taking vital signs, and similar tasks) against defined "critical element" steps — missing one of those specific critical steps fails that particular skill outright, regardless of how well the rest of the skill was performed, which is why hands-on practice under evaluation-like conditions matters as much as memorizing content for the written portion.

Every state requires completing a state-approved nurse aide training program meeting OBRA-87's federal minimum of 75 clock hours, including at least 16 hours of supervised clinical practice, before a candidate is eligible to test. Which specific vendor (NNAAP/Credentia, Prometric, or Headmaster) administers the exam in a given state — and therefore which exact question count and time limit applies — is determined entirely by that state's nurse aide registry program, not by the candidate's choice, so confirming your specific state's vendor before beginning exam prep is worthwhile.

Cost varies by both state and by which vendor administers the exam — there's no single national fee. Because many working CNAs are employed by (or entering employment with) a healthcare facility at the time of testing, exam costs are sometimes covered or reimbursed by an employer as part of onboarding, which is worth asking about directly rather than assuming the full cost is always out-of-pocket for the candidate. Confirm the specific current fee with your own state's nurse aide registry or approved training program.

CNA certification is not a one-time, permanent credential — it requires periodic renewal set by each state's nurse aide registry, and most states run a two-year renewal cycle (though a few require annual renewal, and a few allow longer cycles). Many states additionally require documented paid work as a CNA during the certification period to remain on the registry — commonly a minimum of around 8 hours of nursing-related work within the 24-month cycle — separate from any continuing-education hours also required (commonly 24 hours of in-service training per two-year cycle in states like Florida and Texas, the latter including required content specifically on geriatrics and dementia care). If a certificate lapses for more than 24 months, or a candidate can't document the required recent paid work, most states require retaking the full state-approved training program and competency exam from scratch rather than a simple renewal.

Because both the knowledge test and skills evaluation must be passed independently, split study time between memorizing content (vital sign ranges, OBRA resident rights, infection control) and physically rehearsing the skills checklist step-by-step, ideally with someone watching for critical-element steps you might skip out of habit. Since retake caps are common, treat your first attempt at each part as the one to be genuinely ready for.

No national-level changes to the OBRA-87 75-hour training minimum have been publicly announced as of August 2026, and this exam's core structure (state-administered, vendor-dependent question count/timing, knowledge plus skills evaluation) remains genuinely state-variable by design rather than through any recent policy shift. Because renewal rules, work-hour requirements, and continuing-education mandates are set and periodically adjusted at the state level, CNAs approaching a renewal deadline should verify current requirements directly with their own state's nurse aide registry rather than relying on a general national summary.