While giving a dose of Shingrix the syringe came loose from the needle and part of the dose was lost. Will the patient be protected with this partial dose or does it need to be repeated?

A dose less than the full 0.5 mL dose is generally not considered valid and should generally be repeated. If the patient is still in the office the dose can be repeated immediately. If the repeat dose cannot be given on the same day CDC recommends that it should be given 4 weeks after the invalid dose. The provider does have discretion as to whether the amount of vaccine lost is negligible, to make a decision not to repeat the dose of vaccine.