ONC
The ONC is the Orthopaedic Nurses Certification Board's specialty credential for registered nurses working in orthopaedic and musculoskeletal care — from joint-replacement units and spine surgery floors to fracture clinics and sports-medicine settings. Many Magnet-recognized hospitals and orthopaedic service lines now treat ONC as a hiring preference or a clinical-ladder requirement, and the credential travels with you across employers. This page breaks down exactly what the ONC exam tests, how it's delivered through ProctorU, and how to get it done right the first time.
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No upfront fee — you settle only after your verified passing result. We advertise guaranteed results — 100% pass guaranteed or money back.
How the ONC exam is built — at a glance
150
All multiple choice. 135 questions count toward your score; 15 are unscored pilot items seeded throughout the form, so you can't tell which is which.
97
You need at least 97 of the 135 scored questions correct — roughly 72%. The standard is criterion-referenced, not graded on a curve against other candidates.
3h
Three hours for the full 150 items — about 72 seconds per question. There is no section-by-section timer; you manage the whole window yourself.
Every ONC item is classified two ways at once: by the musculoskeletal health condition it concerns (degenerative, trauma, sports, metabolic, inflammatory, pediatric, tumors, neuromuscular) and by the nursing task it tests (pain management, complications, self-care education, activity/positioning, nutrition, psychosocial support). The blueprint fixes how many questions fall into each bucket.
ONC is the entry credential earned by passing this written exam. ONC-A (Advanced) is not an exam — it is awarded through a professional portfolio review for nurses who already hold ONC and practice at an advanced level. So when people say "the ONC exam," they mean this 150-question test; ONC-A is a later, portfolio-based step.
Health-condition domains — bars show each area's approximate share of the 135 scored questions
The largest domain (~51 questions): osteoarthritis, joint replacement, degenerative spine disease, and the post-operative care that dominates orthopaedic units.
~26 questions on fractures, casting and traction, compartment syndrome, fat embolism, and acute trauma management.
~15 questions on ligament and tendon injuries, ACL repair, sprains, strains, and return-to-activity care.
~12 questions on osteoporosis, osteomalacia, Paget's disease, and bone-density management.
~11 questions on rheumatoid arthritis, osteomyelitis, gout, and inflammatory joint conditions.
~7 questions on scoliosis, developmental hip dysplasia, clubfoot, and pediatric orthopaedic care.
~7 questions on benign and malignant bone tumors, limb-salvage surgery, and oncologic orthopaedic nursing.
~6 questions on muscular dystrophy, spinal cord and peripheral nerve conditions affecting movement.
Layered over those conditions, the same items also test nursing tasks: pain management (35–45 questions) and complication prevention (31–41 questions) carry the most weight, followed by self-care education, activity and positioning, then smaller buckets for nutrition and psychosocial support. Percentages above are approximate, derived from the published question counts.
How ONCB's orthopaedic nursing credentials fit together — and which ones involve a proctored exam
| Credential | Code | How it's earned | Exam help on this page? |
|---|---|---|---|
| Orthopaedic Nurse Certified | ONC | 150-question proctored written exam (this page) | Yes |
| Orthopaedic Nurse Certified – Advanced | ONC-A | Professional portfolio review (no exam); requires existing ONC | Portfolio support |
| Orthopaedic Nurse Practitioner – Certified | ONP-C | Separate APN-level proctored exam for nurse practitioners | Ask us |
Most RNs start with ONC. ONC-A is a later step that recognizes advanced practice through a reviewed portfolio rather than a sit-down test, so it cannot be "taken" the way the ONC exam can — our help for ONC-A focuses on portfolio preparation, while the proctored ONC exam is where our pay-after-you-pass model applies.
Two ways to sit the ONC — and what to expect on test day
ONCB offers year-round, computer-based testing through Meazure Learning's national test-center network. Staff verify your current photo ID, store your belongings, and monitor the room. Once your application is approved you have a 90-day eligibility window to schedule and sit the exam.
You can also sit the ONC from home through ProctorU (Meazure Learning), monitored live by a human proctor over webcam. You must install the Guardian secure browser, pass a connection and system check, present a current unexpired ID, and complete a room scan before the exam unlocks.
A current, unexpired government photo ID matching your application name exactly. Since January 2023, ProctorU's Meazure Learning LRP no longer accepts expired IDs.
A clear desk, no notes, no phone within reach, and a webcam scan of the room via the Guardian browser. No one else may enter while you test.
Stay in frame and on-camera the whole three hours. Looking off-screen, talking aloud, leaving the seat, or losing connection can flag the session for review.
ONC is built for experienced orthopaedic RNs
There are hard prerequisites — and the bar is real
Difficulty: ONC is hard for a specific reason — bedside expertise does not automatically map to the exam. Many strong floor nurses know their own unit deeply but get caught out by domains they rarely touch (metabolic bone disease, tumors, pediatric ortho) and by the pharmacology and pathophysiology framing of pain and complication questions. Three hours of dense, application-style items after a full shift is its own challenge — which is exactly the pressure point our help is built to remove.
The ONC is a high-stakes, three-hour specialty exam standing between you and a credential your unit or clinical ladder may require. Exam Assist pairs you with a vetted orthopaedic nursing specialist and works on a pay-after-you-pass model — so the risk sits with us, not you. No upfront fee, guaranteed results: Exam Assist handles the sitting end to end, and you settle only after the verified result.
Tell us your delivery method (center or ProctorU), your eligibility window, your test date, and the domains you're weakest on. Takes a couple of minutes over WhatsApp, Telegram, or Discord.
We review your timeline and the ONC blueprint and tell you plainly whether it's realistic — before any money is discussed. If it isn't a fit, we say so.
Exam Assist handles the sitting end to end. You're matched with an ortho-nursing specialist who maps the work around the condition and task domains, the 97-correct threshold, and the ProctorU environment — discreetly and confidentially.
You only pay once your passing result is confirmed. No verified result, nothing owed.
Pay-after-you-pass support for RN and specialty nursing exams, including the ONC. Vetted nurse specialists, fully confidential.
ServiceThe ONC online option runs on ProctorU with the Guardian browser — see how we work with remotely proctored exams.
BookStart a confidential conversation about your ONC exam. Honest feasibility first, pay only after a verified pass.
See the full pay-after-you-pass nursing exam service, the model, and how matching works.
Straight answers about the ONC orthopaedic nursing exam
Sibling nursing certifications and our service
Pair with a vetted nurse specialist on a results-first arrangement. No upfront fee — settle only after a verified passing result.
Explore the service CMSRNThe MSNCB credential for medical-surgical nurses — a common adjacent certification for ortho floor staff.
View exam CNORThe CCI credential for OR nurses — relevant if you scrub or circulate on orthopaedic surgical cases.
View exam CCRNAACN's critical-care credential — for ortho-trauma and post-surgical ICU nurses managing complex patients.
View exam CENBCEN's emergency credential — fractures and acute musculoskeletal trauma are core ED work.
View exam CNLCNC's leadership credential — for ortho nurses moving into care-coordination and unit-leadership roles.
View examGet expert ONC help with no upfront fee — you settle only after your verified passing result. Honest feasibility answer first, results-first arrangement always.