Can Blood Work Tell If Had Hep B Vaccine

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Ask the Experts

Hep B Vaccine

My blood work was done immediately after Hep B vaccination. My WBC was low, about 2.7. Would the vaccine have any effect whatsoever?
Barbara McGovern, M.D.

Response from Barbara McGovern, M.D.

Tufts University School of Medicine
...If the blood test was done within hours, I would not expect the vaccine to produce this effect on your WBC. I would simply recheck the WBC for Read more »

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U.S. Centers for Disease Control and Prevention

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Test Positive Aware Network

Hepatitis B: The Other Hepatitis Virus

...It's also fine -- and not dangerous -- to be vaccinated if you've been vaccinated before or had HBV some time in your life. If blood tests show that you're protected from hepatitis B infection, the vaccination isn't necessary. The vaccine is also... Read more »