| Ebastine; Carbastine | Respiratory | LC/MS/MS | 50-20000 pg/mL ; 1-400 ng/mL | Human EDTA K3 Plasma |
| Efavirenz | Infectious Disease | LC/MS/MS | 20-4000 ng/mL | Human Plasma |
| Eletriptan; Desmethyl eletriptan | Pain | LC/MS/MS | 500-250000 pg/mL | Human EDTA Plasma |
| Enalapril; Enalaprilat | Cardiovascular | LC/MS/MS | 0.5-100 ng/mL | Human EDTA Plasma |
| Enalapril; Enalaprilat | Cardiovascular | LC/MS/MS | 0.5-200 ng/mL | Human EDTA Plasma |
| Eniluracil | Oncology | LC/MS/MS | 1-250 ng/mL | Human Plasma |
| Entacapone | Central Nervous System Agents | LC/MS/MS | 10-2000 ng/mL | Human EDTA Plasma |
| Ephedrine | Respiratory | LC/MS/MS | 1-100 ng/ml | Human EDTA Plasma |
| Epirubicin | Oncology | LC/MS/MS | 5-1000 ng/mL | Rabbit Plasma |
| Epirubicin;Epirubicinol | Oncology | LC/MS/MS | 5-1000 ng/mL; 2-200 ng/mL | Human Sodium Heparinized Plasma |
| Eplerenone | Cardiovascular | LC/MS/MS | 10-2500 ng/mL | Human EDTA Plasma |
| Erlotinib | Oncology | LC/MS/MS | 10-5000 ng/mL | Human Plasma |
| Erythromycin | Infectious Disease | LC/MS/MS | 20-1000 ng/mL | Human EDTA Plasma |
| Erythromycin | Infectious Disease | LC/MS/MS | 50-20000 ng/mL | Human Urine |
| Erythromycin; Erythromycin Ethylsuccinate | Infectious Disease | LC/MS/MS | 20-2000 ng/mL | Human EDTA Plasma |
| Erythropoietin | Miscellaneous | ELISA | 10-4000 mIU/mL | Human Serum |
| Escitalopram | Central Nervous System Agents | LC/MS/MS | 0.2-50 ng/mL | Human Plasma |
| Escitalopram | Central Nervous System Agents | LC/MS/MS | 0.2-30 ng/mL | Human K3 EDTA Plasma |
| Esomeprazole | Gastrointestinal | LC/MS/MS | 1.5-750 ng/mL | Human EDTA Plasma |
| Estradiol | Endocrinology | LC/MS/MS | 2.5-100 pg/mL | Human EDTA Plasma |
| Estradiol; 17 Beta | Endocrinology | GC/MS/MS | 0.625-80 pg/mL | Human Serum |
| Estradiol; 17 beta | Endocrinology | GC/MS/MS | 0.625-80 pg/mL | Human Heparin Plasma |
| Estrone | Endocrinology | GC/MS/MS | 1.56-200 pg/mL | Human Heparin Plasma |
| Estrone | Endocrinology | GC/MS/MS | 1.56-200 pg/mL | Human Serum |
| Estrone (Total) | Endocrinology | LC/MS/MS | 50-50000 pg/mL | Human EDTA Plasma |
| Estrone Conjugates | Endocrinology | GC/MS/MS | 3.13-800 pg/mL | Human Heparin Plasma |
| Estrone Conjugates | Endocrinology | GC/MS/MS | 3.13-800 pg/mL | Human Serum |
| Estrone; Estradiol | Endocrinology | LC/MS/MS | 5-1000 pg/mL and 2.5-100 pg/mL | Post Menopausal Human EDTA Plasma |
| Eszopiclone | Central Nervous System Agents | LC/MS/MS | 0.25-50 ng/mL | Human Plasma |
| Ethanol | Miscellaneous | GC/MS | 5-500 µg/mL | Human Whole Blood |
| Ethinyl Estradiol | Endocrinology | LC/MS/MS | 1-100 pg/mL | Human EDTA Plasma |
| Ethinyl Estradiol; Nestorone | Endocrinology | GC/MS/MS | 10-1000 pg/mL; 50-5000 pg/mL | Human Serum |
| Ethinyl Estradiol;Gestodene | Endocrinology | LC/MS/MS | 2-250 pg/mL;50-25000 pg/mL | Human EDTA Plasma |
| Etidronic Acid | Rheumatology | GC/MS | 2-800 ng/mL | Human EDTA Plasma |
| Etodolac | Pain | HPLC/UV | 100-40000 ng/mL | Human EDTA Plasma |
| Etonogestrel(3-Ketodesogestrel) | Endocrinology | LC/MS/MS | 25-5000 pg/mL | Human EDTA Plasma |
| Etoposide | Oncology | LC/MS/MS | 20-5000 ng/mL | Human Serum |
| Etoposide | Oncology | LC/MS/MS | 20-5000 ng/mL | Human EDTA Plasma |
| Everolimus | oncology | LC/MS/MS | 100-100000 pg/mL | Human Whole Blood |
| Exemestane | Oncology | LC/MS/MS | 200-40000 pg/mL | Human Sodium Heparinized Plasma |
| Exemestane | Oncology | LC/MS/MS | 200-30000 pg/mL | Human EDTA Plasma |
| Ezetimibe (Total) | Cardiovascular | LC/MS/MS | 200-75000 pg/mL | Human EDTA Plasma |
| Ezetimibe (Unconjugated) | Cardiovascular | LC/MS/MS | 40-10000 pg/mL | Human EDTA Plasma |