Penicilloyl G or Penicillin G (benzylpenicillin) is an antibiotic drug that occurs naturally. It is used as a cure for various bacterial diseases and infections such pneumonia, syphilis, tetanus, and more. When this antibiotic binds itself with proteins and reacts, there is a creation of antigens of the penicillin allergy. The Allergy Test detects the presence of IgE antigens in the blood that leads to the penicillin allergy. It is a short test, conducted as a routine blood check-up. The results provide information about the probable medical consequences resulting from this allergy.