anchor.diff:  "676-7","Microscopy","Microscopic observation","Nom",
   "678-3","Microscopy","Microscopic observation","Nom",
   "680-9","Microscopy","Microscopic observation","Nom",
  -"6812-2","IgM Antibody","Dengue virus Ab.IgM","Qn","Dengue virus (includes types 1-4)"
  +"6812-2","IgM Antibody","Dengue virus Ab.IgM","Qn","Dengue virus"
   "688-2","Culture","Neisseria gonorrhoeae","Ord","Neisseria gonorrhoeae"
   "690-8","Culture","Neisseria gonorrhoeae","Ord","Neisseria gonorrhoeae"
   "6911-2","IgG Antibody","Brucella abortus Ab.IgG","Qn","Brucella abortus"
  
positive.code: "21189-6","PCR/amplification","Chlamydia trachomatis DNA","Ord","Chlamydia trachomatis"
  "21190-4","PCR/amplification","Chlamydia trachomatis DNA","Ord","Chlamydia trachomatis"
  "21191-2","PCR/amplification","Chlamydia trachomatis DNA","Ord","Chlamydia trachomatis"
  "21262-1","Toxin assay","Escherichia coli shiga-like","Ord","Shiga toxin producing E. coli"
  "21363-7","PCR/amplification","Legionella Species by PCR","Ord","Legionella species"
  "21414-8","PCR/amplification","Neisseria gonorrhoeae DNA","Ord","Neisseria gonorrhoeae"
  "21415-5","PCR/amplification","Neisseria gonorrhoeae DNA","Ord","Neisseria gonorrhoeae"
  "21416-3","PCR/amplification","Neisseria gonorrhoeae DNA","Ord","Neisseria gonorrhoeae"
  
negative.code: "13953-5","e Antibody (HBeAb)","Hepatitis B virus little e Ab","Ord","Hepatitis B"
  "13954-3","e Antigen (HBeAg)","Hepatitis B virus little e Ag","Ord","Hepatitis B"
  "13955-0","Total Antibody","Hepatitis C virus Ab","Ord","Hepatitis C"
  "13956-8","PCR/amplification","Mycobacterium tuberculosis DNA","Ord","Mycobacterium tuberculosis complex"
  "14077-2","IgG Antibody","Borrelia burgdorferi Ab.IgG","Qn","Borrelia burgdorferi"
  "14078-0","IgM Antibody","Borrelia burgdorferi Ab.IgM","Qn","Borrelia burgdorferi"
  "14125-9","Microscopy","Entamoeba histolytica","Qn","Entamoeba histolytica"
  "14127-5","Culture","Neisseria gonorrhoeae","Ord","Neisseria gonorrhoeae"
  "141-2","Ceftriaxone susceptibility","Ceftriaxone","OrdQn",
  "14198-6","Total Antibody","Chlamydophila psittaci Ab","Qn","Chlamydia psittaci"
  "14202-6","IgA Antibody","Chlamydia trachomatis C Ab.IgA","Qn","Chlamydia trachomatis, serotype C"
  "14203-4","IgA Antibody","Chlamydia trachomatis C Ab.IgG","Qn","Chlamydia trachomatis, serotype C"
  "14209-1","IgA Antibody","Francisella tularensis Ab.IgA","Ord","Francisella tularensis"
  "14210-9","Antigen by DFA/IF","Giardia lamblia Ag","Ord","Giardia lamblia"
  "14211-7","IgG Antibody","Hepatitis E virus Ab.IgG","Ord","Hepatitis E virus"
  