Nursing care
Preoperative Checklist: the method, the errors, and the exam
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
The preoperative checklist confirms a patient is safe and correctly prepared before surgery: signed consent, confirmed NPO status, jewellery and dentures removed, the surgical site marked by the surgeon, and an allergy band applied. The nurse verifies each item is correctly completed; the nurse does not obtain informed consent, which remains the surgeon's responsibility.
What the skill is for
The preoperative checklist exists to catch preventable errors before a patient enters the operating room, where they become far harder and more dangerous to correct. Wrong-site surgery, aspiration under anaesthesia, and burns from retained jewellery during electrocautery are rare precisely because this checklist is followed rigorously, not because these risks are theoretical.
The checklist is a verification tool, not a documentation task to complete after the fact. Each item on it represents a specific harm the check is designed to prevent: consent verifies the patient agreed to this specific procedure, NPO status prevents aspiration, jewellery and dentures removal prevents burns and airway obstruction, site marking prevents the surgeon operating on the wrong location, and the allergy band prevents an allergic reaction from a medication or material given during the case.
The method, step by step
Confirm informed consent is signed and matches the planned procedure exactly, including laterality if applicable. The nurse checks that the form is present, signed, witnessed, and consistent with the surgical schedule; the nurse never obtains the consent itself, since that conversation about risks, benefits, and alternatives is the surgeon's legal and clinical responsibility.
Verify NPO status against the ordered fasting time, typically eight hours for a full meal and two hours for clear fluids under current guidelines, and ask the patient directly rather than relying only on the chart. Remove and secure all jewellery, including body piercings, along with dentures, hearing aids, and any prosthetics, documenting where each item was placed. Confirm the surgical site has been marked by the surgeon, using a marker visible after skin preparation, and that the mark is on the correct side and site. Apply and verify an allergy identification band, cross-checking it against the documented allergy list, and complete the final vital signs and voiding check before transfer.
Where it goes wrong
The most serious and most heavily tested error is a nurse who witnesses or obtains consent themselves when the surgeon has not yet had the risk-benefit conversation with the patient. If a patient tells the nurse they don't understand the procedure or have questions about it, the correct response is to stop, not proceed, and notify the surgeon to return and clarify before consent is considered valid.
A second common error is treating NPO status as satisfied because a chart order exists, without confirming with the patient that it was actually followed. Patients sometimes eat or drink against instructions and do not always volunteer this unprompted. A third error is assuming site marking is optional for procedures without obvious laterality, such as a hernia repair on a specific side; marking is required whenever there is any possibility of confusion about site, side, or level, and skipping it because the marking pen was inconvenient to find is not a defensible shortcut.
Practising it deliberately
Run through the checklist verbally with a peer, playing the roles of nurse and patient, and practise the specific phrasing you would use to confirm each item rather than just reciting the list from memory. Practise identifying, out loud, what you would do if any single item fails: an unsigned consent form, a patient who ate breakfast against instructions, or a missing site mark.
Deliberately rehearse the escalation path for a consent problem, since this is where students freeze under exam pressure and in clinical practice alike. The correct sequence is always: identify the gap, do not proceed, notify the surgeon or appropriate provider, and document what you found and what action you took. Practising this sequence as a fixed response, rather than improvising each time, is what makes it reliable when you are managing several preoperative patients at once.
Applying it on the exam
NCLEX items on this checklist most often test the boundary between nursing responsibility and surgeon responsibility, specifically around consent. Expect a question describing a patient with unanswered questions about a procedure, where the correct answer is to notify the surgeon rather than to explain the procedure yourself or proceed with signing.
You may also see a scenario testing priority: given several preoperative tasks, which do you address first. Safety items that prevent irreversible harm, such as an incomplete consent or an unmarked site, outrank administrative items like paperwork sequencing. A question may also test your knowledge of current NPO guidelines, where the trap answer uses an outdated blanket rule such as "nothing after midnight" instead of the differentiated fasting times based on what was last consumed.
A worked example
A patient scheduled for a left knee arthroscopy tells the preoperative nurse, "I thought they were doing my right knee." The consent form and surgical schedule both list the left knee. The correct nursing action is to stop the preoperative process, do not proceed to the operating room, and notify the surgeon immediately to clarify and resolve the discrepancy with the patient before anything else continues.
A second worked example: during the final checklist review, the nurse notices the patient is still wearing a wedding ring that will not come off over the knuckle. The correct action is not to skip this item because time is short; tape the ring securely if it truly cannot be removed, following facility policy, and document that it remains in place along with the safety measure taken. Proceeding to surgery with an unaddressed, undocumented ring is the wrong answer regardless of time pressure.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our reduction of risk potential practice questions are the closest set to what this page covers.
One question from the reduction of risk potential set
Four hours after a cardiac catheterization via the right femoral artery, the nurse notes the client's right dorsalis pedis pulse is now faint and the foot is cool and pale. What is the nurse's priority action?
Rationale
A pulse that was present and is now faint, with a cool, pale extremity distal to the puncture site, is arterial occlusion until proven otherwise — a limb-threatening complication that needs the provider now. Documenting and rechecking wastes the window, warming treats the symptom and masks the change, and asking the client to move the ankle neither restores flow nor gives you new information.
Answer: C
Common questions
Does the preoperative nurse obtain informed consent from the patient?
No. The surgeon is responsible for the informed consent discussion covering risks, benefits, and alternatives. The nurse's role is to verify the consent form is signed, witnessed, and matches the scheduled procedure, and to notify the surgeon if the patient expresses confusion or unanswered questions.
What are the current NPO guidelines nurses should verify before surgery?
Common fasting guidelines specify around eight hours for a full meal, six hours for a light meal, and two hours for clear fluids, though exact timing can vary by facility protocol and anaesthesia plan. Always confirm against the specific preoperative order and ask the patient directly rather than assuming compliance.
Why must the surgical site be marked by the surgeon rather than the nurse?
Site marking by the surgeon, done with the patient awake and able to confirm the correct site and side, is a core part of surgical safety protocols designed to prevent wrong-site surgery. The nurse verifies the mark is present and correct as part of the checklist but does not perform the marking.
What should the nurse do if a patient ate breakfast despite NPO instructions?
Notify the surgeon and anaesthesia provider immediately rather than proceeding with the scheduled surgery time. The procedure will likely need to be delayed or rescheduled to reduce the risk of aspiration under anaesthesia, and this must be documented clearly.
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