| Scopolamine | Gastrointestinal | LC/MS/MS | 50-10000 pg/mL | Human Plasma |
| Sertraline | Central Nervous System Agents | LC/MS/MS | 0.25-75 ng/mL | Human EDTA Plasma |
| Sertraline | Central Nervous System Agents | LC/MS/MS | 0.25-75 ng/mL | Human K3 EDTA Plasma |
| Sertraline | Central Nervous System Agents | LC/MS/MS | 0.1-50 ng/mL | Human EDTA Plasma |
| Sibutramine; N-Mono-desmethyl-sibutramine; N-di-desmethyl-sibutramine | Central Nervous System Agents | LC/MS/MS | 50-25000 pg/mL; 100-50000pg/mL; 100-50000pg/mL | Heparin Human Plasma |
| Sibutramine; N-mono-desmethyl-sibutramine; N-didesmethyl-sibutramine | Central Nervous System Agents | LC/MS/MS | 50-12500 pg/mL ; 100-5000 pg/mL ; 100-10000pg/mL | Human Sodium Heparinized Plasma |
| Sildenafil; Desmethyl sildenafil | Cardiovascular | LC/MS/MS | 2-500 ng/mL | Human Plasma |
| Sildenafil; Desmethyl Sildenafil | Cardiovascular | LC/MS/MS | 2-500 ng/mL ; 1-250 ng/mL | Human EDTA Plasma |
| Simvastatin and ß-Hydroxy Acid Simvastatin | Cardiovascular | LC/MS/MS | 100-20000 pg/mL; 100-5000 pg/nL | Human EDTA Plasma |
| Simvastatin; ß-Hydroxy Acid Simvastatin | Cardiovascular | LC/MS/MS | 100-20000 pg/mL; 100-5000 pg/mL | Human K3 EDTA Plasma |
| Sirolimus | Immunology | LC/MS/MS | 50-20000 pg/mL | Human Whole Blood |
| Sirolimus | Immunology | LC/MS/MS | 0.25-50 ng/mL | Human Whole Blood |
| Solifenacin | Genitourinary | LC/MS/MS | 100-20000 pg/mL | Human Plasma |
| Sorafenib | Oncology | LC/MS/MS | 10-5000 ng/mL | Human K2 EDTA Plasma |
| Spironolactone | Cardiovascular | LC/MS/MS | 1-200 ng/mL | Human EDTA Plasma |
| Spironolactone and Canrenone | Cardiovascular | LC/MS/MS | 0.5-100 ng/mL | Human EDTA Plasma |
| Stavudine | Infectious Disease | LC/MS/MS | 2.5-2000 ng/mL | Human EDTA Plasma |
| Sumatriptan | Pain | LC/MS/MS | 0.5-50 ng/mL | Human EDTA Plasma |
| Sumatriptan | Pain | LC/MS/MS | 0.5-100 ng/mL | Human Plasma |
| Sunitinib; n-desethyl-sunitinib | Oncology | LC/MS/MS | 0.25-100 ng/mL | Human EDTA Plasma |
| Synephrine | Cardiovascular, Ophtalmic | LC/MS/MS | 1-100 ng/mL | Human EDTA Plasma |