108 IU/ml by itself is not really bad. What other tests did the doctor order? What are the results of those tests?
In the mean time, please go through http://www.medhelp.org/health_pages/Hepatitis/HepB-Introduction--Welcome-Page/show/34?cid=153
looks as if he may be a healthy carrier but wont be definitive until we get all results from his hepB profile
if you can list his hbaag, hbsab, hbeag, hbeab, hbcab and his liver function showing his ALT and AST then someone on here can better assist you