is not necessary" (by CDC)

CDC Fact Sheet

Post-vaccination Testing

After routine vaccination of infants, children, adolescents, or adults post-vaccination testing for adequate antibody response is not necessary.

Post-vaccination testing IS recommended for persons whose medical management will depend on knowledge of their immune status.

This includes persons who:
*are immunocompromised (e.g., hemodialysis patients) *received the vaccine in the buttock
*are infants born to HBsAg (hepatitis B surface antigen)-positive mothers
*are healthcare workers who have contact with blood
*are sex partners of persons with chronic hepatitis B virus infection
*Post-vaccination testing should be completed 1-2 months after the third vaccine dose for results to be meaningful.
*A protective antibody response is 10 or more milliinternational units (>=10mIU/mL).

http://www.cdc.gov/ncidod/diseases/hepatitis/b/factvax.htm