One should not rely on medical or social history to assess the risk of bloodborne infections. A uniform practice of testing every source patient is the standard. This requires the patient's consent for testing. Ideally, you should not have to obtain the consent yourself, and there should be a mechanism in place for that to be done. This should be done as promptly as possible.
Time is of the essence, especially with short hospital stays, or exposures in outpatient settings.
Since exposures often take place in the surgical or delivery room area, the source patient's ability to give consent for testing may be delayed. The results of recent anti-HBs testing may be sufficient. Chemoprophylaxis with immune globulin or antiviral medications may be recommended in some situations. The need for follow-up tests is determined largely by the source patient's availability for testing and the results of such tests. This is why reporting the incident is so important.