Post-immunization titres to determine immunity following a complete vaccine series are often not necessary. For example, anti-HBs titres following completed hepatitis B virus vaccination series are unnecessary in the general population. Similarly, serologic testing for measles, mumps and rubella immunity following two doses of MMR is not necessary. For more information:
Naus, M. Immunization of those with no or inadequate immunization records and the role of serological testing. BCMJ. 2016 May;58 (4):232-238.
Public Health Agency of Canada. Hepatitis B vaccine: Canadian Immunization Guide. [Internet] 2017.
Public Health Agency of Canada. Measles vaccine: Canadian Immunization Guide. [Internet] 2015.