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case 5: EBV antibodies

Parts Now: 91.21.1
Epstein Barr virus [EBV] ANTIBODIES (EA or EBNA or VCA) (EIA). € 13.75
91.21.2 Epstein Barr virus [EBV] ANTIBODIES (EA or EBNA or VCA) (Titration by IF). . € 12.70
91.21.3 Epstein Barr virus [EBV] heterophilic antibodies (rapid test). € 7.80
91.21.4 Epstein Barr virus [EBV] heterophilic antibodies [R. Paul Bunnell Davidsohn]. € 8.85

Questions:

1. obsolete titration using IF? Paul Bunnell Davidsohn
2. obsolete?
3. typical panel (EBNA + EA + + VCAG VCAM) 91.21.1 x = 4?

link:
http://www.cdc.gov/ncidod/diseases/ebv.htm
http://www.labtestsonline.org/understanding/analytes/ebv/glance.html