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Table 4 Most frequently ordered reference laboratory add-on tests

From: Impact of add-on laboratory testing at an academic medical center: a five year retrospective study

Test % of Total Add-on Orders
Helicobacter pylori antibody, IgG 0.050 %
Mitochondrial M2 antibodies 0.049 %
Hepatitis C virus quantitative PCR 0.033 %
IgG subclasses 0.022 %
Miscellaneous testa 0.019 %
Vitamin D, 1,25-dihydroxy 0.018 %
Aldosterone, serum 0.017 %
Alpha-1-antitrypsin, phenotyping 0.013 %
Lyme disease antibodies, IgG and IgM 0.013 %
Histoplasma antigen, urine 0.013 %
  1. aCovers any test ordered that is not on list of laboratory tests built in electronic medical record
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