| Serum Apearance | Serum Copper |
| SGOT (AST) | SGPT (ALT) |
| Sodium | Special Biochemistry |
| Selenium | Serum Free Kappa |
| Serum Free Lambda | Serum Myoglobin |
| Stool PH | Sweat test |
| Sn RNP-C | Stool – H pylori Ag |
| Stool Calprotectin | Stool Lactoferrin |
| SHBG | Specific Gravity(Random) |
| Stool Culture | Sput.D.BK |
| Synovial F.D.S | Synovial F.C.BK |
| STONE ANALYSIS | Scotch test |
| Stool Exam | Stool Osmolality |
| Sirolimus | Sandhoff |
| SLOS-Amnion | SRY gene |
| Stool M2PK | SEQUENTIAL |
| SECOND TRIMESTER SCREENING | Sputum Cytology |
| Skeletal Dysplasia |
