The protocol for a needle stick injury follows a clear sequence: immediate wound care, reporting the incident, testing both the injured person and the source patient, and starting preventive medications when needed. Speed matters because the most effective preventive treatment for HIV must begin within 72 hours, and hepatitis B protection works best within 24 hours.
Immediate First Aid
Wash the injury site with soap and water right away. If blood or body fluid splashed into your eyes, nose, or mouth, flush with clean water or saline. Cover the wound with a clean bandage.
You may feel the urge to squeeze the wound to force out contaminated blood, but this is discouraged. Squeezing can damage tissue and may actually increase exposure by drawing more blood flow to the area. Simple washing with soap and water is the recommended approach from the CDC.
Reporting the Injury
Report the incident to your supervisor or occupational health department immediately. This triggers two things: your access to timely medical evaluation and the legal documentation your employer is required to maintain.
Under OSHA regulations, employers must record all work-related needle stick injuries involving contact with another person’s blood or potentially infectious material on the OSHA 300 Log. To protect privacy, your name is not entered on this log. If you are later diagnosed with a bloodborne disease from the exposure, your employer must update the record to reflect the illness.
How the Risk Breaks Down by Pathogen
Not all needle stick exposures carry the same level of danger. The type of pathogen in the source patient’s blood dramatically changes your risk:
- Hepatitis B carries the highest transmission risk, estimated between 6 and 30 percent from a single percutaneous exposure. The wide range depends on how actively the virus is replicating in the source patient.
- Hepatitis C falls in the middle, with transmission rates generally cited around 1.8 percent per exposure.
- HIV has the lowest transmission risk at approximately 0.3 percent, or about 1 in 300 exposures.
These numbers apply to hollow-bore needles with visible blood. Solid needles (like suture needles) and superficial scratches carry lower risk. A deeper puncture, a needle that was visibly bloody, or a source patient with a high viral load all push the risk higher.
Source Patient Testing
Whenever possible, the source patient is tested for HIV, hepatitis B, and hepatitis C. Hospital staff will work with you to identify the patient and obtain consent for blood draws. Knowing the source patient’s status quickly is critical because it determines whether you need preventive medications and which ones.
If the source patient tests negative for all three viruses, the exposure is generally considered low risk. If the source is unknown or cannot be tested (a discarded needle in a sharps container, for example), the protocol typically proceeds as if the source could be positive, and decisions about preventive treatment are made based on the circumstances of the exposure.
Baseline Blood Work on the Exposed Person
You will have blood drawn as soon as possible after the injury. This baseline testing establishes your infection status at the time of exposure, which matters both medically and legally. The standard panel includes an HIV combination test, hepatitis B surface antibody (to check your vaccine immunity), hepatitis B surface antigen, hepatitis B core antibody, and hepatitis C antibody. If you plan to take preventive medications, a basic metabolic panel, complete blood count, and pregnancy test (if applicable) are also drawn to make sure the drugs are safe for you.
HIV Prevention: The 72-Hour Window
Post-exposure prophylaxis for HIV, commonly called PEP, is a 28-day course of antiretroviral medication. The key deadline is 72 hours: PEP should be started as soon as possible after exposure and no later than three days out. Earlier is better, and many protocols push for initiation within hours rather than days.
The medications are typically a combination of two or three antiretroviral drugs taken once or twice daily. Side effects can include nausea, fatigue, and headache, but most people tolerate the regimen. You will need follow-up appointments during the 28 days to monitor for side effects and ensure you complete the full course.
Hepatitis B Prevention
Your hepatitis B protocol depends entirely on your vaccination history. If you were fully vaccinated and have documented immunity, you likely need no additional treatment. If you were vaccinated but never had your immunity confirmed with a blood test, you will typically receive a single vaccine booster dose.
If you are unvaccinated or incompletely vaccinated and the source patient is hepatitis B positive, you will receive hepatitis B immune globulin (a shot of protective antibodies) plus the first dose of the hepatitis B vaccine, ideally within 24 hours. These are given as separate injections at different sites on the body. You then complete the full vaccine series on schedule. This combination approach is highly effective at preventing infection when given promptly.
Hepatitis C: No Preventive Treatment Available
Unlike HIV and hepatitis B, there is no vaccine or post-exposure medication to prevent hepatitis C infection. The protocol instead relies on early detection. Your blood is tested for hepatitis C viral load immediately and again at 4 to 6 weeks. A hepatitis C antibody test follows at 4 to 6 months.
The reason early detection matters is that hepatitis C is now highly curable. If testing picks up an infection in its early stages, treatment with direct-acting antiviral medications achieves cure rates above 95 percent. The “wait and treat” approach replaces prevention because the treatment is so effective, though catching the infection early requires that you complete all follow-up testing.
Follow-Up Testing Schedule
After the baseline draw, you will return for blood tests at scheduled intervals. The standard timeline looks like this:
- 6 weeks: HIV combination test. Hepatitis C viral load.
- 3 months: HIV combination test.
- 6 months: HIV combination test. Hepatitis C antibody. Hepatitis B surface antigen and core antibody (if you received hepatitis B prophylaxis).
This schedule exists because different viruses have different detection windows. HIV can take up to 6 months to produce detectable antibodies in rare cases, though most infections are detectable by 6 weeks with modern combination tests. Hepatitis C antibodies may not appear for 4 to 6 months. Completing the full testing schedule is the only way to definitively confirm you were not infected.
Reducing Needle Stick Injuries
Safety-engineered devices, such as retractable needles and self-sheathing IV catheters, significantly reduce needle stick rates. A CDC-evaluated intervention that replaced standard IV catheter devices with safety-engineered versions found a statistically significant decrease in percutaneous injuries from IV catheters. These devices are now required under the federal Needlestick Safety and Prevention Act for most healthcare settings.
Beyond device design, the highest-risk moments tend to be recapping needles, transferring blood between containers, and disposing of sharps. Using a one-handed scoop technique instead of two-handed recapping, activating safety features immediately after use, and never overfilling sharps containers are practical habits that lower your risk on every shift.