If your school uses both the HESI Exit Exam and the ATI Comprehensive Predictor, your scores will disagree. Here's what each one actually measures, what the research supports, and which signal deserves more weight.
You took the HESI Exit and scored 820. You took the ATI Comprehensive Predictor and got a 94% predicted probability of passing the NCLEX. Or the opposite, a 950 on HESI and an 82% on ATI. Either way, you're now stuck trying to figure out which number to believe.
Both are predictive instruments. Neither is the NCLEX. Each has been studied separately, each correlates meaningfully with NCLEX outcomes, and neither produces a clean prediction at the individual level. Programs that use both rarely tell students how to reconcile a conflict, so most students default to whichever score was higher, which is exactly the wrong heuristic.
Below: what each exam is, how the scoring works, what the published research actually says, and a practical framework for reading conflicting signals.
What you'll get:
- HESI Exit Exam (E2): format, scoring, score interpretation
- ATI Comprehensive Predictor: format, scoring, probability interpretation
- A side-by-side comparison table on five dimensions
- What studies consistently show about each exam's predictive validity
- How to read conflicting scores
- Which one your program likely cares about more (and why)
What the HESI Exit Exam Is
The HESI Exit Exam (E2), sold by Elsevier, is a comprehensive predictor administered near the end of nursing school. It's a fixed-length exam, typically around 150–160 scored items, covering the full nursing curriculum: med-surg, pharmacology, mental health, pediatrics, maternity, leadership, and community.
Scoring runs on a HESI-specific scale, roughly 0 to 1500. The number isn't a percentage, it's an item response theory score scaled to make ranges intuitive.
The cuts students need to know:
- 800–849, generally borderline; many schools consider this a pass with caveats or remediation
- 850–899, commonly cited as the "passing" threshold, associated with high NCLEX probability in Elsevier's published correlation data
- 900+, strong predictor; Elsevier's correlation data has long associated this band with the highest NCLEX-pass probabilities
Different schools set different cuts. A community college might accept 800. A competitive BSN program might require 900 or 950. The number that matters for your program is whatever your handbook says.
Elsevier's commonly cited correlation: an HESI E2 score of 850 has historically correlated with roughly a 90–94% probability of NCLEX-RN passing on first attempt, with the probability climbing past 95% in the 900+ range. These figures come from Elsevier's published validity studies, the exact percentages have varied across versions of the exam.
The HESI Exit uses primarily traditional multiple-choice and select-all-that-apply items. NGN-format items have been added in recent versions but represent a smaller share than they do on the actual NCLEX.
What the ATI Comprehensive Predictor Is
The ATI Comprehensive Predictor, sold by Assessment Technologies Institute (now part of Ascend Learning), is the ATI equivalent of the HESI Exit. It's also a fixed-length exam covering the same curriculum domains, typically around 180 scored items.
ATI scoring reports two numbers:
- A content-area performance percentage (how many items you answered correctly, broken down by topic)
- A predicted probability of passing the NCLEX-RN on the first attempt, typically reported as a single percentage like 88%, 94%, 97%
The probability output is what most schools focus on. Common school cutoffs:
- Below 75%, usually requires remediation; some programs gate graduation
- 75–89%, passing-but-monitor band
- 90–95%, strong predictor band
- 96%+, highest confidence band
Like HESI, the actual cutoff depends on the school. Some programs require 90%+ to walk. Others use 75% as a floor with no upper hurdle.
ATI's predicted probability is generated from a logistic model fit on prior cohorts who took both the Comprehensive Predictor and the actual NCLEX. It's a population-level inference, not a per-student diagnosis.
Side-by-Side: HESI Exit vs. ATI Comprehensive Predictor
| Dimension | HESI Exit Exam (E2) | ATI Comprehensive Predictor |
|---|---|---|
| Publisher | Elsevier | ATI / Ascend Learning |
| Length | ~150–160 scored items | ~180 scored items |
| Score format | 0–1500 scale | Predicted % probability of NCLEX pass |
| Common pass threshold | 850 (school-dependent; 900+ strong) | 75% (school-dependent; 90%+ strong) |
| NGN-format share | Modest; growing in newer versions | Modest; growing in newer versions |
| Question type mix | Heavy traditional MC + SATA | Heavy traditional MC + SATA |
| What the score literally means | An IRT-scaled ability estimate | A modeled probability of NCLEX passage |
| Retake policy | School-determined; usually 2–3 attempts | School-determined; usually 2–3 attempts |
| Cost to student | Often bundled in program fees | Often bundled in program fees |
| Where the score lives | Elsevier Evolve account | ATI account |
The thing this table makes clear: these exams are more alike than different. Both are fixed-length, both cover the full curriculum, both use primarily traditional item types, both report a number that schools then compare against a cutoff. The biggest practical difference is the score format, a raw scaled number (HESI) versus a probability output (ATI).
What the Research Actually Supports
This is where students get the most confused, so let's be careful with the claims.
Both exams have published validity evidence. Multiple peer-reviewed studies over the past 15+ years have examined HESI Exit and ATI Comprehensive Predictor scores against actual NCLEX outcomes. The consistent findings, stated honestly:
- Both exams correlate meaningfully with NCLEX success. Students who score in the top bands on either exam pass the NCLEX at high rates. Students who score in the bottom bands fail at meaningfully higher rates than top-band scorers.
- Neither is perfect. Both exams produce false positives (predicted pass, actual fail) and false negatives (predicted fail, actual pass). The published correlations are strong but not deterministic.
- The two exams' relative predictive accuracy is contested. Some studies have shown HESI to be a slightly stronger predictor; others have shown ATI to be comparable or slightly stronger. Different cohorts, different sample sizes, different methods, the literature does not produce a clear winner.
What the research does not support:
- The claim that one exam is "easier" or "harder" than the other in any rigorous sense. Both are calibrated to the NCLEX blueprint.
- The claim that ATI's probability output is "more scientific" because it's expressed as a percentage. The HESI scaled score is also generated from a statistical model, the surface format is different, the underlying machinery is similar.
- The claim that either exam should be trusted at the individual student level the way it can be trusted at the cohort level. Individual predictions are noisier than the population-level correlations suggest.
The single biggest misuse of either predictor is treating an individual student's score as a verdict. The published correlations describe groups, not individuals. A student with a 75% ATI probability is in a band where roughly 1 in 4 students fail, but you don't know which student.
How to Read Conflicting Scores
If you took both exams and they disagree, here's the framework. It assumes both were taken in similar conditions (no acute illness, similar prep state, no major content change between attempts).
Scenario A, Both scores are in their respective "strong" bands
HESI ≥900 AND ATI ≥90%. The exams agree. Trust the signal, keep your NCLEX prep on schedule, focus on NGN-format practice if your predictors under-represent it.
Scenario B, Both scores are in their "borderline" bands
HESI 800–849 AND ATI 75–89%. The exams agree on a less reassuring story. Treat this as a clear signal to do focused remediation before sitting the NCLEX. The two predictors collectively underestimating you is possible but unlikely.
Scenario C, One strong, one borderline
This is the conflict that drives students to forum posts at 2 a.m. Read it this way:
- The lower score is more likely to be the more honest signal. When two instruments measure similar content and disagree, the lower one is more often a sign of a genuine gap that the higher one missed. Test conditions, fatigue, or content area can also explain the difference.
- Look at content-area breakdowns, not just the composite. Both exams report subscores. The category where you scored noticeably lower on one exam is almost certainly real, regardless of what the composite said.
- Don't average the two scores in your head. Averaging hides patterns. Use the breakdown to find the gap and patch it.
Scenario D, Both scores are weak
HESI below 800 AND ATI below 75%. This is unambiguous: more prep before NCLEX, with serious attention to NGN format and clinical-judgment reasoning. Don't sit the NCLEX on the schedule your program assigned if you have the option to delay. A delayed exam you pass is better than an on-time exam you fail.
Which One Does Your School Care About More?
Here's the practical truth most students don't get told: your school cares about whichever predictor it bought a license for.
A program that contracts with Elsevier for HESI products will use the HESI Exit as its graduation gate, and any conversation about "your predictor" inside that program means HESI. A program that contracts with ATI will use the Comprehensive Predictor the same way. A few programs use both, but one is almost always weighted as the official progression metric.
Practical implications:
- The score that matters for graduation and progression is the one your school's policies cite, regardless of which exam has stronger published validity.
- The score that matters for your NCLEX preparation is the lower of the two if they conflict. Plan for the harder signal.
- If you're going to remediate, remediate against the content-area breakdown that both exams provide. Composite scores are summaries; subscores are diagnoses.
"We use HESI because we've used HESI for fifteen years. The students who fail their HESI and then pass the NCLEX always tell me they took the gap between the two as an instruction, not a vindication."
What Neither Predictor Captures Well
Both exams have a known under-representation of:
- NGN-format items. Both have added bow-tie, matrix, and trend-style items, but both still lean heavily on traditional MC and SATA. The actual NCLEX is roughly 30–40% NGN-format. If your predictor was 90% traditional MC, your score reflects your performance on a less-NGN exam than the one you'll actually sit.
- Time pressure and adaptive difficulty. Both predictors are fixed-length. The NCLEX is adaptive, difficulty rises as you answer correctly. A student who is fine on fixed-length practice can still struggle when item difficulty climbs aggressively.
- Endurance. Both predictors are usually administered in a 3-to-4-hour window; the NCLEX runs up to 5 hours. Fatigue manifests differently at hour 4 than at hour 3.
If your predictor scores were strong but you're worried about the gap, the right preparation is more NGN-format practice and more timed full-length practice, not more comprehensive content review.
A Practical Post-Predictor Study Plan
If your predictor (either one) flagged a content area:
- Drill that single area until your accuracy is consistent at 80%+, in mixed format, untimed.
- Then re-introduce time pressure, same content, timed sets.
- Then add NGN format, same content, NGN clusters where available.
- Then move to mixed-content review that includes the patched area.
If your predictor scores were strong overall but uneven:
- Don't relax on the strong areas, but don't over-study them. They're already strong enough.
- Spend ~70% of remaining prep time on the weakest two areas.
- Add 1–2 timed full-length practice sessions in NGN-heavy format in your final two weeks.
If both predictors said "you're not ready":
Take that seriously. Talk to your program's success coordinator about delaying the NCLEX if your state and program allow. Use the time for structured remediation rather than another month of unfocused review.
Final Takeaway
HESI Exit and ATI Comprehensive Predictor are different tools measuring the same broad construct. Neither is a verdict. Both are useful signals, and when they conflict, the lower score is more often the honest one. Use the content-area breakdown to find your gaps, not the composite to argue with yourself.
Your school will treat one of them as the official metric. The NCLEX will treat neither of them as anything at all. Build a study plan that respects all three.
Practice in the Real NGN Format
Both HESI and ATI under-represent NGN-format items relative to the actual NCLEX. Precision Nursing's free tier is built around NGN, bow-tie, matrix, trend, and extended-response items with full rationales. Start free →. No credit card.
FAQ
Is the HESI Exit harder than the ATI Comprehensive Predictor?
Subjectively, students report different experiences, and the answer often depends on which one they took first. Objectively, both calibrate to the NCLEX blueprint and neither has been shown in a clear, replicated way to be the more difficult instrument.
Which one is more accurate?
Both have published validity evidence. The literature does not produce a clear winner. Both correlate meaningfully with NCLEX outcomes; neither is deterministic at the individual student level.
What if my predictor score was high but I'm worried about NGN?
Spend your remaining prep time disproportionately on NGN-format items. The predictors under-represent NGN compared to the actual NCLEX, so a high predictor score combined with limited NGN practice is a known gap.
My school uses both predictors. Which one counts for graduation?
Read your program handbook. One is almost always designated as the official progression metric. Email the program coordinator if it isn't explicit; you do not want to discover this during senior capstone.
Should I take the predictor I'm not required to take, just to see?
Only if (a) it's free or low-cost and (b) you have time to study after it. A "just to see" predictor that comes back weak and demoralizes you the week before the NCLEX is a net-negative use of time.
What's a "good" score on each?
Common strong-band thresholds: HESI Exit 900+, ATI Comprehensive Predictor 90%+. School-dependent. Your handbook is the authority for your program.
Want a Single Source for Both?
Precision Nursing's content covers the full NCLEX blueprint, including the NGN formats both predictors under-represent, with rationales that explain the clinical reasoning, not just the right letter. Start 1,000+ free questions →. Free forever. No credit card.