Although this is an old thread, I'd like to point out some things.

TS's antibody assay is for Anti-EBV-VCA IgA, IgA is Immunoglobulin A. The IgA use in EBV diagnosis is not really for EBV infection itself, it's for EBV risk factor in NPC, nasopharyngeal carcinoma, a cancer that has a significant endemicity in Malaysia's Chinese-ethnic population.

If you wish to test for an ACUTE, SUB-ACUTE EBV infection [the kind TS' post is about], the immunoglobulins that should be tested for is IgM and IgG.

Thanks for the extra info. I don't think I have EBV infection.
I just wanted to rule out NPC, just like blood test for PSA, CA19.9 etc....
By any chance you know where to get this tested?

Any clinic that sends out blood sampling to a pathology lab will suffice, just ask the doctor first if their preferred patho lab can do it or not.
But generally just ask the doctor you normally go to if it is even worth the effort.

And no, you cannot rule out NPC by just an EBV load/serotiter result. It is merely ONE risk factor in NPC.