Testing for Mononucleosis

In day to day practice, I order a monospot to screen for mono. But sometimes, the monospot can give a false negative reading (especially early in the disease). For those times where I need something more sensitive (and more expensive), I will order this:

EBV VCA IgM

Which affectionately stands for Epstein-Barr Virus, Virus Capsid Antigen IgM.