| Famotidine | Gastrointestinal | LC/MS | 0.5-200 ng/mL | Human EDTA Plasma |
| Felbinac | Pain | HPLC/FLR | 5-2000 ng/mL | Human Serum |
| Felodipine | Cardiovascular | LC/MS/MS | 20-10000 pg/mL | Human EDTA Plasma |
| Fenofibric Acid | Cardiovascular | LC/MS/MS | 50-25000 ng/mL | Dog EDTA Plasma |
| Fenofibric Acid | Cardiovascular | LC/MS/MS | 50-20000 ng/mL | Human EDTA Plasma |
| Fenofibric Acid | Cardiovascular | HPLC/UV | 50-25000 ng/mL | Human EDTA Plasma |
| Fentanyl | Pain | LC/MS/MS | 25-10000 pg/mL | Dog Serum |
| Fentanyl | Pain | LC/MS/MS | 10-5000 pg/mL | Human EDTA Plasma |
| Fentanyl | Pain | LC/MS/MS | 0.025-5 ng/mL | Human EDTA K3 Plasma |
| Fexofenadine | Respiratory | LC/MS/MS | 2-1000 ng/mL | Human EDTA Plasma |
| Fexofenadine | Respiratory | LC/MS/MS | 10-5000 ng/mL | Human Urine |
| Finasteride | Genitourinary | LC/MS/MS | 0.5-50 ng/mL | Human EDTA K3 Plasma |
| Finasteride | Genitourinary | LC/MS/MS | 0.5-200 ng/mL | Human EDTA Plasma |
| Flecainide | Cardiovascular | HPLC/FLR | 2-500 ng/mL | Human EDTA Plasma |
| Flosequinan | Cardiovascular | HPLC | 20-1600 ng/mL | Human Plasma |
| Flosequinan; Sulfone Metabolite | Cardiovascular | LC/MS/MS | 10-800 ng/mL | Human Heparinized Plasma |
| Fluconazole | Infectious Disease, Dermatology | LC/MS/MS | 50-7500 ng/mL | Human Sodium Heparinized Plasma |
| Fluorouracil | Oncology | LC/MS/MS | 5-2500 ng/mL | Human Sodium Heparinized Plasma |
| Fluorouracil | Oncology | LC/MS/Ms | 10-5000 ng/mL | Stabilized Human EDTA Plasma |
| Fluoxetine; Norfluoxetine | Central Nervous System Agents | LC/MS | 0.5-60 ng/mL | Human EDTA Plasma |
| Fluoxetine;Norfluoxetine;Ondansetron | LC/MS/MS | 2-1000 ng/mL;5-2500 ng/mL;2.5-1000 ng/mL | Rat Plasma | |
| Fluvastatin | Cardiovascular | LC/MS/MS | 5-400 ng/mL | Human Sodium Heparinized Plasma |
| Fluvoxamine | Central Nervous System Agents | LC/MS/MS | 0.5-200 ng/mL | Human EDTA Plasma |
| Fosinopril | Cardiovascular | LC/MS/MS | 100-10000 pg/mL | Human EDTA Plasma |
| Fosinoprilat | Cardiovascular | LC/MS/MS | 1-500 ng/mL | Human EDTA K3 Plasma |
| FSH (Follicle Stimulating Hormone) | Endocrinology | RIA | 2-100 mIU/mL | Human Serum |
| Furosemide | Cardiovascular | LC/MS/MS | 5-1000 ng/mL | Human Urine |
| Furosemide | Cardiovascular | LC/MS/MS | 50-4000 ng/mL | Human EDTA K2 Plasma |