| 38287-9 | 2,2-Dichloropropionate [Mass/volume] in Water | 2,2-Dichloropropionate |
| 15007-8 | 2,3-Diphosphoglycerate [Molecules/volume] in Red Blood Cells | 2,3-Diphosphoglycerate |
| 1675-8 | 2,3-Diphosphoglycerate [Mass/volume] in Red Blood Cells | 2,3-Diphosphoglycerate |
| 1676-6 | 2,3-Diphosphoglycerate [Mass/volume] in Serum | 2,3-Diphosphoglycerate |
| 49217-3 | 2,3-Diphosphoglycerate [Molecules/mass] in Red Blood Cells | 2,3-Diphosphoglycerate |
| 12984-1 | 2,4 toluenediamine [Mass/volume] in Blood | 2,4 toluenediamine |
| 38727-4 | 2,4 toluenediamine [Mass/volume] in Air | 2,4 toluenediamine |
| 6971-6 | 2,4 toluenediamine [Mass/volume] in Urine | 2,4 toluenediamine |
| 38729-0 | 2,4,5-Trichlorophenol [Mass/volume] in Air | 2,4,5-Trichlorophenol |
| 13005-4 | 2,4,5-Trichlorophenoxyacetate [Type] in Serum or Plasma | 2,4,5-Trichlorophenoxyacetate |
| 38331-5 | 2,4,5-Trichlorophenoxyacetate [Mass/volume] in Water | 2,4,5-Trichlorophenoxyacetate |
| 38730-8 | 2,4,6-Trichlorophenol [Mass/volume] in Air | 2,4,6-Trichlorophenol |
| 43725-1 | 2,4-Dichlorophenol [Presence] in Urine | 2,4-Dichlorophenol |
| 16767-6 | None | 2,4-Dichlorophenoxyacetate |
| 27338-3 | 2,4-Dichlorophenoxyacetate [Mass/volume] in Serum or Plasma | 2,4-Dichlorophenoxyacetate |
| 38286-1 | 2,4-Dichlorophenoxyacetate [Mass/volume] in Water | 2,4-Dichlorophenoxyacetate |
| 38582-3 | 2,4-Dichlorophenoxyacetate [Mass/volume] in Air | 2,4-Dichlorophenoxyacetate |
| 9806-1 | 2,4-Dichlorophenoxyacetate [Mass/volume] in Urine | 2,4-Dichlorophenoxyacetate |
| 38741-5 | 2,4-Dinitrophenol [Mass/volume] in Air | 2,4-Dinitrophenol |
| 9308-8 | 2,4-Dinitrophenylhydrazine reacting substances [Presence] in Urine | 2,4-Dinitrophenylhydrazine reacting substances |
| 38742-3 | 2,4-Dinitrotoluene [Mass/volume] in Air | 2,4-Dinitrotoluene |
| 38754-8 | 2,4-Toluene diisocyanate [Mass/volume] in Air | 2,4-Toluene diisocyanate |
| 43724-4 | 2,5-Dichlorophenol [Presence] in Urine | 2,5-Dichlorophenol |
| 12986-6 | 2,5-Hexanedione [Mass/volume] in Blood | 2,5-Hexanedione |
| 31170-4 | 2,5-Hexanedione [Mass/volume] in Urine | 2,5-Hexanedione |
| 31171-2 | 2,5-Hexanedione/Creatinine [Mass ratio] in Urine | 2,5-Hexanedione/Creatinine |
| 12985-8 | 2,6 toluenediamine [Mass/volume] in Blood | 2,6 toluenediamine |
| 6972-4 | 2,6 toluenediamine [Mass/volume] in Urine | 2,6 toluenediamine |
| 38687-0 | 2-Acetylaminofluorene [Mass/volume] in Air | 2-Acetylaminofluorene |
| 38728-2 | 2-Aminotoluene [Mass/volume] in Air | 2-Aminotoluene |
| 17572-9 | 2-Butanol [Mass/volume] in Blood | 2-Butanol |
| 9682-6 | 2-Butanol [Mass/volume] in Unspecified specimen | 2-Butanol |
| 35585-9 | 2-Butoxyacetate [Mass/volume] in Urine | 2-Butoxyacetate |
| 38651-6 | 2-Chloro-1,3-Butadiene [Mass/volume] in Air | 2-Chloro-1,3-Butadiene |
| 38655-7 | 2-Chloroacetophenone [Mass/volume] in Air | 2-Chloroacetophenone |
| 50266-6 | 2-Dechloroethylifosfamide [Mass/volume] in Blood --1 day post dose ifosfamide | 2-Dechloroethylifosfamide^1D post dose ifosfamide |
| 50267-4 | 2-Dechloroethylifosfamide [Mass/volume] in Blood --2 days post dose ifosfamide | 2-Dechloroethylifosfamide^2D post dose ifosfamide |
| 50268-2 | 2-Dechloroethylifosfamide [Mass/volume] in Blood --3 days post dose ifosfamide | 2-Dechloroethylifosfamide^3D post dose ifosfamide |
| 50271-6 | 2-Dechloroethylifosfamide [Mass/volume] in Blood --3 hours post dose ifosfamide | 2-Dechloroethylifosfamide^3H post dose ifosfamide |
| 50269-0 | 2-Dechloroethylifosfamide [Mass/volume] in Blood --4D post dose ifosfamide | 2-Dechloroethylifosfamide^4D post dose ifosfamide |
| 50270-8 | 2-Dechloroethylifosfamide [Mass/volume] in Blood --5 days post dose ifosfamide | 2-Dechloroethylifosfamide^5D post dose ifosfamide |
| 50272-4 | 2-Dechloroethylifosfamide [Mass/volume] in Blood --6 hours post dose ifosfamide | 2-Dechloroethylifosfamide^6H post dose ifosfamide |
| 50265-8 | 2-Dechloroethylifosfamide [Mass/volume] in Blood --pre dose ifosfamide | 2-Dechloroethylifosfamide^pre dose ifosfamide |
| 47807-3 | 2-Deoxytetronate/Creatinine [Molecular ratio] in Urine | 2-Deoxytetronate/Creatinine |
| 35587-5 | 2-Ethoxyacetate [Mass/volume] in Urine | 2-Ethoxyacetate |
| 13668-9 | 2-Ethyl-3-Hydroxypropionate/Creatinine [Mass ratio] in Urine | 2-Ethyl-3-Hydroxypropionate/Creatinine |
| 29523-8 | 2-Ethyl-3-Hydroxypropionate/Creatinine [Molecular ratio] in Urine | 2-Ethyl-3-Hydroxypropionate/Creatinine |
| 49809-7 | 2-Ethyl-3-Hydroxypropionate/Creatinine [Molecular ratio] in 24 hour Urine | 2-Ethyl-3-Hydroxypropionate/Creatinine |
| 47808-1 | 2-Ethylhydracrylate/Creatinine [Molecular ratio] in Urine | 2-Ethylhydracrylate/Creatinine |
| 41858-2 | 2-Ethylidene-1,5-Dimethyl-3,3-Diphenylpyrrolidine (EDDP) [Presence] in Urine | 2-Ethylidene-1,5-Dimethyl-3,3-Diphenylpyrrolidine |
| 41859-0 | 2-Ethylidene-1,5-Dimethyl-3,3-Diphenylpyrrolidine (EDDP) [Presence] in Unspecified specimen | 2-Ethylidene-1,5-Dimethyl-3,3-Diphenylpyrrolidine |
| 41860-8 | 2-Ethylidene-1,5-Dimethyl-3,3-Diphenylpyrrolidine (EDDP) [Presence] in Serum or Plasma | 2-Ethylidene-1,5-Dimethyl-3,3-Diphenylpyrrolidine |
| 50542-0 | 2-Ethylidene-1,5-Dimethyl-3,3-Diphenylpyrrolidine (EDDP) [Mass/volume] in Urine | 2-Ethylidene-1,5-Dimethyl-3,3-Diphenylpyrrolidine |
| 16303-0 | 2-Hexanol [Mass/volume] in Urine | 2-Hexanol |
| 16304-8 | 2-Hexanol/Creatinine [Mass ratio] in Urine | 2-Hexanol/Creatinine |
| 29880-2 | 2-Hydroxy-3-Methylvalerate [Presence] in Urine | 2-Hydroxy-3-Methylvalerate |
| 13669-7 | 2-Hydroxy-3-Methylvalerate/Creatinine [Mass ratio] in Urine | 2-Hydroxy-3-Methylvalerate/Creatinine |
| 29505-5 | 2-Hydroxy-3-Methylvalerate/Creatinine [Molecular ratio] in Urine | 2-Hydroxy-3-Methylvalerate/Creatinine |
| 49810-5 | 2-Hydroxy-3-Methylvalerate/Creatinine [Molecular ratio] in 24 hour Urine | 2-Hydroxy-3-Methylvalerate/Creatinine |
| 13670-5 | 2-Hydroxyadipate/Creatinine [Mass ratio] in Urine | 2-Hydroxyadipate/Creatinine |
| 29500-6 | 2-Hydroxyadipate/Creatinine [Molecular ratio] in Urine | 2-Hydroxyadipate/Creatinine |
| 49811-3 | 2-Hydroxyadipate/Creatinine [Molecular ratio] in 24 hour Urine | 2-Hydroxyadipate/Creatinine |
| 49826-1 | 2-Hydroxyestrone [Mass/volume] in Serum or Plasma | 2-Hydroxyestrone |
| 49828-7 | 2-Hydroxyestrone & 16-Alpha hydroxyestrone panel in Serum or Plasma | 2-Hydroxyestrone & 16-Alpha hydroxyestrone panel |
| 49827-9 | 2-Hydroxyestrone/16-Alpha hydroxyestrone [Mass ratio] in Serum or Plasma | 2-Hydroxyestrone/16-Alpha hydroxyestrone |
| 29881-0 | 2-Hydroxyglutarate [Presence] in Urine | 2-Hydroxyglutarate |
| 43635-2 | 2-Hydroxyglutarate [Presence] in 24 hour Urine | 2-Hydroxyglutarate |
| 13672-1 | 2-Hydroxyglutarate/Creatinine [Mass ratio] in Urine | 2-Hydroxyglutarate/Creatinine |
| 29502-2 | 2-Hydroxyglutarate/Creatinine [Molecular ratio] in Urine | 2-Hydroxyglutarate/Creatinine |
| 49812-1 | 2-Hydroxyglutarate/Creatinine [Molecular ratio] in 24 hour Urine | 2-Hydroxyglutarate/Creatinine |
| 27981-0 | 2-Hydroxyisobutyrate [Presence] in Urine | 2-Hydroxyisobutyrate |
| 29501-4 | 2-Hydroxyisobutyrate/Creatinine [Molecular ratio] in Urine | 2-Hydroxyisobutyrate/Creatinine |
| 43226-0 | 2-Hydroxyisocaproate [Presence] in Urine | 2-Hydroxyisocaproate |
| 13673-9 | 2-Hydroxyisocaproate/Creatinine [Mass ratio] in Urine | 2-Hydroxyisocaproate/Creatinine |
| 29503-0 | 2-Hydroxyisocaproate/Creatinine [Molecular ratio] in Urine | 2-Hydroxyisocaproate/Creatinine |
| 44282-2 | 2-Hydroxyisocaproate/Creatinine [Mass ratio] in 24 hour Urine | 2-Hydroxyisocaproate/Creatinine |
| 49813-9 | 2-Hydroxyisocaproate/Creatinine [Molecular ratio] in 24 hour Urine | 2-Hydroxyisocaproate/Creatinine |
| 29882-8 | 2-Hydroxyisovalerate [Presence] in Urine | 2-Hydroxyisovalerate |
| 13674-7 | 2-Hydroxyisovalerate/Creatinine [Mass ratio] in Urine | 2-Hydroxyisovalerate/Creatinine |
| 29504-8 | 2-Hydroxyisovalerate/Creatinine [Molecular ratio] in Urine | 2-Hydroxyisovalerate/Creatinine |
| 49814-7 | 2-Hydroxyisovalerate/Creatinine [Molecular ratio] in 24 hour Urine | 2-Hydroxyisovalerate/Creatinine |
| 29883-6 | 2-Hydroxyphenylacetate [Presence] in Urine | 2-Hydroxyphenylacetate |
| 44283-0 | 2-Hydroxyphenylacetate/Creatinine [Mass ratio] in Urine | 2-Hydroxyphenylacetate/Creatinine |
| 47534-3 | 2-Hydroxyphenylacetate/Creatinine [Molecular ratio] in Urine | 2-Hydroxyphenylacetate/Creatinine |
| 47809-9 | 2-Hydroxysebacate/Creatinine [Molecular ratio] in Urine | 2-Hydroxysebacate/Creatinine |
| 48608-4 | 2-Hydroxyvalerate/Creatinine [Mass ratio] in Urine | 2-Hydroxyvalerate/Creatinine |
| 16305-5 | 2-Methoxyethanol [Mass/volume] in Blood | 2-Methoxyethanol |
| 30577-1 | 2-methyl,3-hydroxybutyrate (C5-OH) [Presence] in Urine | 2-Methyl,3-Hydroxybutyrate |
| 13675-4 | 2-methyl,3-hydroxybutyrate (C5-OH)/Creatinine [Mass ratio] in Urine | 2-Methyl,3-Hydroxybutyrate/Creatinine |
| 25082-9 | 2-methyl,3-hydroxybutyrate (C5-OH)/Creatinine [Molecular ratio] in Urine | 2-Methyl,3-Hydroxybutyrate/Creatinine |
| 47535-0 | None | 2-Methyl,3-Hydroxybutyrate/Creatinine |
| 49815-4 | 2-methyl,3-hydroxybutyrate (C5-OH)/Creatinine [Molecular ratio] in 24 hour Urine | 2-Methyl,3-Hydroxybutyrate/Creatinine |
| 46750-6 | 2-methyl,3-hydroxybutyric Acidemias/Beta-Ketothiolase Deficiency [interpretation] in Blood dot (filter paper) Qualitative | 2-Methyl,3-Hydroxybutyric acidemias &or beta ketothiolase deficiency |
| 50086-8 | 2-methyl,3-hydroxybutyrylcarnitine (C4-OH) [Molecules/volume] in Blood dot (filter paper) | 2-Methyl,3-Hydroxybutyrylcarnitine (C4-OH) |
| 50087-6 | 2-methyl,3-hydroxybutyrylcarnitine (C4-OH) [Molecules/volume] in Amniotic Fluid | 2-Methyl,3-Hydroxybutyrylcarnitine (C4-OH) |
| 50088-4 | 2-methyl,3-hydroxybutyrylcarnitine (C4-OH) [Molecules/volume] in Cerebral spinal fluid | 2-Methyl,3-Hydroxybutyrylcarnitine (C4-OH) |
| 50089-2 | 2-methyl,3-hydroxybutyrylcarnitine (C4-OH) [Molecules/volume] in Urine | 2-Methyl,3-Hydroxybutyrylcarnitine (C4-OH) |
| 50090-0 | 2-methyl,3-hydroxybutyrylcarnitine (C4-OH) [Molecules/volume] in Serum or Plasma | 2-Methyl,3-Hydroxybutyrylcarnitine (C4-OH) |
| 50091-8 | 2-methyl,3-hydroxybutyrylcarnitine (C4-OH)/Creatinine [Molecular ratio] in Urine | 2-methyl,3-hydroxybutyrylcarnitine (C4-OH)/Creatinine |
| 47810-7 | 2-Methyl,3-Hydroxyvalerate [Molecules/volume] in Plasma | 2-Methyl,3-Hydroxyvalerate |
| 50085-0 | 2-Methyl,3-Hydroxyvalerate/Creatinine [Molecular ratio] in Urine | 2-Methyl,3-Hydroxyvalerate/Creatinine |
| 47811-5 | 2-Methyl,3-Oxobutyrate/Creatinine [Molecular ratio] in Urine | 2-Methyl,3-Oxobutyrate/Creatinine |
| 17683-4 | 2-Methyl-2-Propanol [Mass/volume] in Blood | 2-Methyl-2-Propanol |
| 9683-4 | 2-Methyl-2-Propanol [Mass/volume] in Unspecified specimen | 2-Methyl-2-Propanol |
| 29884-4 | 2-Methylbutyrylglycine [Presence] in Urine | 2-Methylbutyrylglycine |
| 24435-0 | 2-Methylbutyrylglycine/Creatinine [Molecular ratio] in Urine | 2-Methylbutyrylglycine/Creatinine |
| 27097-5 | 2-Methylbutyrylglycine/Creatinine [Mass ratio] in Urine | 2-Methylbutyrylglycine/Creatinine |
| 12539-3 | 2-Methylcitrate [Mass/volume] in Urine | 2-Methylcitrate |
| 12540-1 | 2-Methylcitrate [Mass/volume] in Serum or Plasma | 2-Methylcitrate |
| 26811-0 | 2-Methylcitrate [Molecules/volume] in Urine | 2-Methylcitrate |
| 26904-3 | 2-Methylcitrate [Molecules/volume] in Serum or Plasma | 2-Methylcitrate |
| 29876-0 | 2-Methylcitrate [Presence] in Urine | 2-Methylcitrate |
| 34626-2 | 2-Methylcitrate [Molecules/volume] in Amniotic Fluid | 2-Methylcitrate |
| 50092-6 | 2-Methylcitrate [Molecules/volume] in Cerebral spinal fluid | 2-Methylcitrate |
| 13773-7 | 2-Methylcitrate/Creatinine [Mass ratio] in Urine | 2-Methylcitrate/Creatinine |
| 25114-0 | 2-Methylcitrate/Creatinine [Molecular ratio] in Urine | 2-Methylcitrate/Creatinine |
| 44284-8 | 2-Methylcitrate/Creatinine [Molecular ratio] in 24 hour Urine | 2-Methylcitrate/Creatinine |
| 47812-3 | 2-Methylglutaconate/Creatinine [Molecular ratio] in Urine | 2-Methylglutaconate/Creatinine |
| 47813-1 | 2-Methylglutarate/Creatinine [Molecular ratio] in Urine | 2-Methylglutarate/Creatinine |
| 17276-7 | 2-Methylpentane [Mass/volume] in Blood | 2-Methylpentane |
| 54101-1 | 2-Methylpropyl methylphosphonate [Mass/volume] in Urine | 2-Methylpropyl methylphosphonate |
| 38711-8 | 2-Nitropropane [Mass/volume] in Air | 2-Nitropropane |
| 29864-6 | 2-Oxo,3-Methylvalerate [Presence] in Urine | 2-Oxo,3-Methylvalerate |
| 35869-7 | 2-Oxo,3-Methylvalerate [Molecules/volume] in Serum or Plasma | 2-Oxo,3-Methylvalerate |
| 13676-2 | 2-Oxo,3-Methylvalerate/Creatinine [Mass ratio] in Urine | 2-Oxo,3-Methylvalerate/Creatinine |
| 25083-7 | 2-Oxo,3-Methylvalerate/Creatinine [Molecular ratio] in Urine | 2-Oxo,3-Methylvalerate/Creatinine |
| 49816-2 | 2-Oxo,3-Methylvalerate/Creatinine [Molecular ratio] in 24 hour Urine | 2-Oxo,3-Methylvalerate/Creatinine |
| 45185-6 | 2-Oxo-3-Hydroxy-Lysergate diethylamide [Mass/volume] in Urine | 2-Oxo-3-Hydroxy-Lysergate diethylamide |
| 13677-0 | 2-Oxoadipate/Creatinine [Mass ratio] in Urine | 2-Oxoadipate/Creatinine |
| 28584-1 | 2-Oxoadipate/Creatinine [Ratio] in Urine | 2-Oxoadipate/Creatinine |
| 29506-3 | 2-Oxoadipate/Creatinine [Molecular ratio] in Urine | 2-Oxoadipate/Creatinine |
| 29865-3 | 2-Oxoisocaproate [Presence] in Urine | 2-Oxoisocaproate |
| 3290-4 | 2-Oxoisocaproate [Mass/volume] in Urine | 2-Oxoisocaproate |
| 35870-5 | 2-Oxoisocaproate [Molecules/volume] in Serum or Plasma | 2-Oxoisocaproate |
| 4100-4 | 2-Oxoisocaproate [Mass] of Dose | 2-Oxoisocaproate |
| 13679-6 | 2-Oxoisocaproate/Creatinine [Mass ratio] in Urine | 2-Oxoisocaproate/Creatinine |
| 25084-5 | 2-Oxoisocaproate/Creatinine [Molecular ratio] in Urine | 2-Oxoisocaproate/Creatinine |
| 49817-0 | 2-Oxoisocaproate/Creatinine [Molecular ratio] in 24 hour Urine | 2-Oxoisocaproate/Creatinine |
| 29866-1 | 2-Oxoisovalerate [Presence] in Urine | 2-Oxoisovalerate |
| 35868-9 | 2-Oxoisovalerate [Molecules/volume] in Serum or Plasma | 2-Oxoisovalerate |
| 13680-4 | 2-Oxoisovalerate/Creatinine [Mass ratio] in Urine | 2-Oxoisovalerate/Creatinine |
| 25085-2 | 2-Oxoisovalerate/Creatinine [Molecular ratio] in Urine | 2-Oxoisovalerate/Creatinine |
| 49818-8 | 2-Oxoisovalerate/Creatinine [Molecular ratio] in 24 hour Urine | 2-Oxoisovalerate/Creatinine |
| 3291-2 | 2-Pyridone [Mass/volume] in Serum or Plasma | 2-Pyridone |
| 4101-2 | 2-Pyridone [Mass] of Dose | 2-Pyridone |
| 3292-0 | 2-Pyridone/N'-methylnicotinamide [Mass ratio] in Serum or Plasma | 2-Pyridone/N'-Methylnicotinamide |
| 1678-2 | 20-Hydroxyprogesterone [Mass/volume] in Serum | 20-Hydroxyprogesterone |
| 53628-4 | 20q chromosome deletion [Identifier] in Blood or Tissue by Fluorescent in situ hybridization (FISH) Nominal | 20q chromosome deletion |
| 50093-4 | 21-Deoxycortisol [Molecules/volume] in Amniotic Fluid | 21-Deoxycortisol |
| 50250-0 | 21-Deoxycortisol [Molecules/volume] in Serum or Plasma | 21-Deoxycortisol |
| 53341-4 | 21-Deoxycortisol [Mass/volume] in Blood dot (filter paper) | 21-Deoxycortisol |
| 53342-2 | 21-Deoxycortisol [Molecules/volume] in Blood dot (filter paper) | 21-Deoxycortisol |
| 50097-5 | 21-Deoxycortisol [Molecules/volume] in Serum or Plasma --1 hour post 250 ug corticotropin | 21-Deoxycortisol^1H post 250 ug corticotropin |
| 50096-7 | 21-Deoxycortisol [Molecules/volume] in Serum or Plasma --30 minutes post 250 ug corticotropin | 21-Deoxycortisol^30M post 250 ug corticotropin |
| 50094-2 | 21-Deoxycortisol [Molecules/volume] in Serum or Plasma --45 minutes post 250 ug corticotropin | 21-Deoxycortisol^45M post 250 ug corticotropin |
| 50095-9 | 21-Deoxycortisol [Molecules/volume] in Serum or Plasma --pre 250 ug corticotropin | 21-Deoxycortisol^pre 250 ug corticotropin |
| 17781-6 | 21-Hydroxylase Ab [Units/volume] in Serum | 21-Hydroxylase Ab |
| 1679-0 | 24r-Hydroxycalcidiol [Mass/volume] in Serum or Plasma | 24r-Hydroxycalcidiol |
| 46269-7 | 25-Hydroxycalciferol [Molecules/volume] in Serum or Plasma | 25-Hydroxycalciferol |
| 49054-0 | 25-Hydroxycalciferol [Mass/volume] in Serum or Plasma | 25-Hydroxycalciferol |
| 34552-0 | None | 2D echocardiogram panel |
| 21971-7 | None | 2nd course treatment |
| 21970-9 | None | 2nd course treatment start date |
| 42047-1 | None | 2nd course treatment.biological reponse modifier therapy |
| 42045-5 | None | 2nd course treatment.chemotherapy |
| 42046-3 | None | 2nd course treatment.hormonal therapy |
| 42048-9 | None | 2nd course treatment.other therapy |
| 42044-8 | None | 2nd course treatment.radiation |
| 42043-0 | None | 2nd course treatment.surgery |
| 21972-5 | None | 2nd course treatment.surgery.other regional disease |