IBSC Certified Designated Infection Control Officer (DICO-C) Certification Practice Exam 2026 - Free Infection Control Practice Questions and Study Guide

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When is anti-HBs titer measured after completing the hepatitis B vaccine series?

1-2 months after completion.

After finishing the hepatitis B vaccine series, the immune system needs time to produce detectable anti-HBs antibodies. About 1–2 months after the final dose is when most people who respond will have a measurable, protective level. Testing earlier wouldn’t reflect the full response, and waiting longer (like 6 months) isn’t the standard window for verifying seroprotection, though antibody levels can persist or wane over time. Testing before vaccination would offer no information about the vaccine response.

6 months after completion.

Immediately after first dose.

Before vaccination.