anchor.diff:  "19259-1","Antigen (not B) by Latex agglutination","Neisseria meningitidis A+C+w135+Y Ag","Ord","Neisseria meningitidis"
   "193-3","Clindamycin susceptibility","Clindamycin","OrdQn",
   "20396-8","Levofloxacin susceptibility","Levofloxacin","OrdQn",
  -"20416-4","PCR/amplification","Hepatitis C virus RNA","Qn","Hepatitis C"
  -"20442-0","PCR/amplification","Hepatitis B virus DNA","Qn","Hepatitis B"
  +"20416-4","PCR/amplification","Hepatitis C virus RNA","Qn","Hepatitis C virus"
  +"20442-0","PCR/amplification","Hepatitis B virus DNA","Qn","Hepatitis B virus"
   "20449-5","Total Antibody","Borrelia burgdorferi Antibody","Ord","Borrelia burgdorferi"
   "20474-3","Culture","Bacteria identified","Nom",
   "20479-2","IgG Antibody","Measles virus Ab.IgG","Ord","Measles virus"
  
positive.code: "13921-2","Culture","Mumps virus","Ord","Mumps virus"
  "13950-1","IgM Antibody","Hepatitis A virus Ab.IgM","Ord","Hepatitis A virus (human enterovirus 72)"
  "13951-9","Total Antibody","Hepatitis A virus Ab","Ord","Hepatitis A virus (human enterovirus 72)"
  "13952-7","Core Antibody (HBcAb)","Hepatitis B virus core Ab","Ord","Hepatitis B"
  "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"
  
negative.code: "10670-8","Culture","Giardia sp identified","Nom",
  "10671-6","Identification","Helminth identified","Nom",
  "10672-4","Identification","Helminth+Arthropod identified","Nom",
  "10673-2","Core Antigen (HBcAg)","Hepatitis B virus core Ag","Ord","Hepatitis B virus"
  "10674-0","Surface Antigen (HBsAg)","Hepatitis B virus surface Ag","Ord","Hepatitis B virus"
  "10675-7","Surface Antigen (HBsAg)","Hepatitis B virus surface Ag","Nom",
  "10676-5","PCR/amplification","Hepatitis C virus RNA","Qn","Hepatitis C virus"
  "10701-1","Microscopy","Ova+Parasites identified","Nom",
  "10702-9","Microscopy","Ova+Parasites identified","Nom",
  "10703-7","Microscopy","Ova+Parasites identified","Nom",
  