I've had a needle stick too. In Washington state the patient can decline to be tested. At that point, it is your decision on what to do. Does the pt have a hx of IV drug abuse?Hepatits?HIV? If so, obviously you would just go on anti-retrovirals. If not, you still have the right to protect yourself if you want to go on anti-retrovirals. It's usually not suggested though unless the pt is moderate to high risk, because of the nasty side effects... but of course it's your life and your choice.
You do want to be sure no matter what that you get rechecked. My facility policy was to recheck me at 4 months, 6 months, and 1 yr. Fortuanatly my pt was very low risk already, and she agreed to the blood test, so I chose not to do anti-retrovirals, but again.. I could have if I wanted to.