Needlestick injury with a source patient who did not disclose his status
During scaling of the mandibular anterior region, a hygienist sustains a needlestick with a Gracey curette that had visible blood on the tip. It penetrates the glove and the left index finger and draws blood. The patient, a 41-year-old man, wrote 'no problems' on the medical history. The hygienist has documentation of two hepatitis B vaccine doses eight years ago with unknown serology. The employer says, 'His chart says no hepatitis, so you're fine - just finish the appointment.' Later, in conversation, the patient mentions he was treated for hepatitis C five years ago and did not think it was relevant.
1. List the immediate post-exposure steps and state the time window that governs HIV post-exposure prophylaxis.
Read the worked answer
Immediately:
- Stop, set the instrument down safely, and wash the wound with soap and running water, allowing it to bleed freely. Do not squeeze, scrub, or apply bleach or caustic agents.
- Report the exposure to the employer the same day - this is a recordable sharps injury and, where required, belongs in the sharps injury log.
- Arrange evaluation by a healthcare provider immediately, ideally within hours, for risk assessment and source evaluation.
HIV PEP: start as soon as possible - ideally within hours of exposure, and no later than 72 hours. It is a 28-day, three-drug regimen and is started based on risk assessment after source testing, but do not let the source result delay the first dose if the exposure is high risk and the result will take time.
HBV: test the hygienist's anti-HBs. If the titer is below 10 mIU/mL after an incomplete or unknown series, hepatitis B immune globulin plus a vaccine dose is indicated; if immune, no action.
HCV: no post-exposure prophylaxis exists. Test for HCV RNA at 4–6 weeks and anti-HCV at 4–6 months.
Note what is not on the list: finishing the appointment first.
2. The employer's statement is wrong on the facts. Explain why 'the chart says no hepatitis' does not discharge the employer's obligation, and outline the ethical duties that attach to the patient's HCV disclosure.
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Why the employer is wrong: a medical history form is a self-report, not a test. This patient has just demonstrated that - he wrote 'no problems' and then disclosed treated hepatitis C. 'Treated' does not mean 'no longer detectable' and does not mean 'no risk'; and the form was never designed to rule out HIV or HBV either. Risk assessment requires source testing, not reassurance.
Ethical duties:
- Confidentiality with need-to-know scope. The patient's HCV status goes to the clinician's exposure-management provider and the minimum administrative chain required by law - not to the whole staff, not to the front desk, not to a discussion in the break room. Disclosing it to colleagues who do not need it to manage the exposure is a breach even if it is true.
- Honesty with the patient. He should be told that an exposure occurred and that his status is relevant, and asked to consent to source testing under whatever the jurisdiction permits. Do not conceal the event to avoid an awkward conversation.
- No punitive response. The hygienist's exposure management does not turn the patient into an adversary. He remains a patient with a right to care.
- Non-abandonment. Do not discharge him for nondisclosure; address the incomplete history directly and update the record.
Record the exposure, the conversation, what was disclosed, and who was notified.
3. The hygienist asks whether she can keep working while awaiting test results, and whether she should have worn heavier gloves. Answer both.
Read the worked answer
Working: yes, in general. There is no reason to restrict a clinician after a needlestick exposure based on the exposure itself; restriction is driven by the clinician's own status, not the exposure. Standard precautions continue unchanged. She should keep follow-up appointments for the testing schedule and report any acute illness with fever, jaundice, or malaise. If she develops a condition that could be transmitted through her own blood, that is a separate evaluation governed by her own provider.
Gloves: heavier gloves are not the answer, and her gloves were not the failure. A needlestick with a contaminated sharp penetrates gloves of any practical thickness. The prevention hierarchy is: eliminate the hazard - do not hand-instrument a bloody site with fingers in the path of the blade; use a proper fulcrum, retract with a mirror rather than fingers, keep the non-dominant hand out of the field; engineered controls - a self-sheathing or safety-engineered device where one is available, and a sharps container at chairside within arm's reach; administrative controls - a written exposure control plan and training. Gloves protect against blood contact with skin and mucous membranes, not against a puncture, and the fix is technique and device, not glove gauge.