Final answer:
The lab test that indicates immunization against hepatitis B more than 2/52 weeks ago is the presence of antibodies to the hepatitis B surface antigen (anti-HBs).
Step-by-step explanation:
The lab test used to indicate immunization against hepatitis B more than 2/52 weeks ago is the presence of antibodies to the hepatitis B surface antigen (anti-HBs). When a person has been successfully vaccinated against hepatitis B, their body produces anti-HBs antibodies as a response to the vaccine. These antibodies provide protection against future infection with the hepatitis B virus.
After receiving the hepatitis B vaccine, it takes time for the body to produce enough antibodies to be detectable through lab testing. This usually occurs within 2-8 weeks after vaccination. Therefore, if a person's anti-HBs antibody test is positive more than 2/52 (2 weeks) after receiving the vaccine, it indicates successful immunization against hepatitis B.
It's important to note that the anti-HBs antibody test is not used to assess the effectiveness of the vaccine immediately after the first dose. It is typically done after completing the entire hepatitis B vaccination series to determine if the person has developed protective antibodies.