You could also try asking your question in the Hepatitis A community this is the Hepatitis C community
http://www.medhelp.org/forums/Hepatitis-A/show/222
I believe it means that you have have a positive (reactive) immunoglobulin to hepatitis A. That will protect you from getting the virus. Were you vaccinated? Or, you may have been exposed at one time.
Please check my answer with your doctor as I am not a medical professional.