Anti-HBs detects the presence of antibodies against HBsAg.The presence of anti-HBs is generally interpreted as indicating recovery and immunity from HBV infection. It also develops in a person who has been successfully vaccinated against Hepatitis B.Usually it is measured in mIU/ML.Reactivity is generally a term used for antigen tests. You may consult the lab for determining what this M stands for. Do write to us with more information on your symptoms. Any test result needs to be correlated clinically. Hope it helps.
Take care and good luck!
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