| Gabapentin | Central Nervous System Agents | LC/MS | 50-10000 ng/mL | Human EDTA Plasma |
| Gabapentin | Central Nervous System Agents | LC/MS | 50-25000 ng/mL | Pig EDTA Plasma |
| Gabapentin | Central Nervous System Agents | LC/MS/MS | 0.05-10 µg/mL | Human Plasma |
| Gabapentin | Central Nervous System Agents | LC/MS | 30-1500 ng/mL | Sheep Sodium Heparinized Plasma |
| Gabapentin | Central Nervous System Agents | LC/MS | 2-250 µg/mL | Sheep Cerebrospinal Fluid (CSF) |
| Gabapentin | Central Nervous System Agents | LC/MS/MS | 0.1-20 ug/mL | Dog Plasma |
| Gabapentin | Central Nervous System Agents | LC/MS/MS | 100-50000 ng/mL | Human Cerebrospinal Fluid (CSF) |
| Gabapentin lactam | Central Nervous System Agents | LC/MS/MS | 3-150 ng/mL | Human EDTA Plasma |
| Galanthamine | Central Nervous System Agents | LC/MS/MS | 0.5-100 ng/mL | Human EDTA Plasma |
| Gemcitabine | Oncology | LC/MS/MS | 100-50000 ng/mL | Human EDTA Plasma |
| Gemfibrozil | Cardiovascular | LC/MS/MS | 100- 40000 ng/mL | Human EDTA Plasma |
| Genistein | Miscellaneous | LC/MS/MS | 10-1000 ng/mL | Mouse Plasma |
| Gestodene | Endocrinology | LC/MS/MS | 50.64-6330 pg/mL | Human EDTA Plasma |
| Gestodene/Ethinyl Estradiol | Endocrinology | LC/MS/MS | 2.50-250 pg/mL | Human Serum |
| Glimepiride | Endocrinology | LC/MS/MS | 1-500 ng/mL | Human EDTA Plasma |
| Glimepiride | Endocrinology | LC/MS/MS | 1-250 ng/mL | Human EDTA K3 Plasma |
| Glipizide | Endocrinology | LC/MS/MS | 1-500 ng/mL | Human EDTA Plasma |
| Glucose | Miscellaneous | ELISA | 12-300 mg/dL | Human serum |
| Glyburide | Diabetes | LC/MS/MS | 1-300 ng/mL | Human Heparin Plasma |
| Glyburide | Diabetes | LC/MS/MS | 2-300 ng/mL | Human EDTA Plasma |
| Glyburide | Diabetes | LC/MS/MS | 1 - 300 ng/mL | K2EDTA human plasma |
| Granisetron | Gastrointestinal | LC/MS/MS | 20-15000 pg/mL | Human Plasma |
| Guaifenesin | Respiratory | LCMSMS | 10-5000 ng/mL | Human EDTA Plasma |
| Guanfacine | Cardiovascular | LCMSMS | TBD | TBD |