| S100BP | S-100B Protein, Serum | — |
| SCPA | Saccharomyces cerevisiae Antibodies, IgG & IgA | — |
| SALI | Salicylate | Photometric Enzymatic Method |
| STYPHI | Salmonella typhi & paratyphi Antibodies | — |
| FABRS | SARS-CoV-2, Influenza A/B & RSV Combo Test | — |
| SCHAG | Schistosoma Antibody IgG, Serum | — |
| SCLER | Scleroderma (Scl-70) (ENA) Antibody, IgG | — |
| FSCPR | Scleroderma Comprehensive Profile | — |
| SCLERD | Scleroderma Profile | — |
| SECRET | Secretin | — |
| ESR | Sed Rate | — |
| SELEP | Selenium, Plasma | — |
| SELER | Selenium, RBC's | — |
| SELE | Selenium, Serum | — |
| SEMB | Semen Analysis w/WHO Morphology | — |
| SPVC | Semen Post Vasectomy Check | — |
| SPR3 | Serine Protease 3 Antibody | — |
| SERQ | Seroquel (Quetiapine) | — |
| HIAA | Serotonin (5HIAA), Urine, 24-hr | — |
| SRAUH | Serotonin Release Assay (SRA), Unfractionated Heparin | — |
| SSER | Serotonin, Serum | — |
| SERO | Serotonin, Whole Blood | — |
| SAA | Serum Amyloid A (SAA) | Electrochemiluminescence (MSD) |
| SHBG | Sex Hormone Bind Globulin | Electrochemiluminescence Immunoassay |
| TRIPCR | Sexually Transmitted Disease Panel 1 by TMA | — |
| SZDIA | Sezary Diagnostic Flow Cytometry, Blood | — |
| SHRIMP | Shrimp IgE | — |
| SIKL | Sickle Cell Solubility Test | — |
| SILWB | Silver, Whole blood | — |
| SINQ | Sinequan (Doxepin) | — |
| SINCU | Sinus Culture | — |
| SIRO | Sirolimus Level (Rapamune), Blood | — |
| SJAB | Sjogren (SSA & SSB) Antibodies | — |
| SLPRPS | SLE Profile | ANAPN - Multiplex Flow Immunoassay; RFPS - Immunoturbidimetric Assay |
| SDLDL | Small Dense LDL Cholesterol, Serum | — |
| SMIT | Smith (ENA) Ab, IgG | — |
| SMITRNP | Smith/RNP (ENA) Ab, IgG | — |
| ASMM | Smooth Muscle Antibody, IgG w/reflex | — |
| NA | Sodium | Ion-Selective Electrode, Direct Potentiometric Method |
| NAK | Sodium & Potassium | Ion-Selective Electrode, Direct Potentiometric Method |
| UNA | Sodium Urine, Random | Ion-Selective Electrode, Direct Potentiometric Method |
| TNA | Sodium Values, 24 Hr. Urine | Ion-Selective Electrode, Direct Potentiometric Method |
| FNAS | Sodium, Body Fluid | Ion-Selective Electrode, Direct Potentiometric Method |
| SOFE | Sodium, Fecal | — |
| RNEWSO | Solid Organ Recipient Re-Evaluation | — |
| STPP | Solid Tumor Precision Panel | — |
| FBMN | Soluble Fibrin Monomer | — |
| SLAAG | Soluble Liver Antigen Ab, IgG | — |
| STR | Soluble Transferrin Receptor | — |
| SOMS | Somatostatin | — |
| SOX1 | SOX1 Antibody, IgG by Immunoblot, Serum | — |
| SOYBN | Soybean, IgE | — |
| USPG | Specific Gravity, Urine | — |
| SMACNA | Spinal Muscular Atrophy (SMA) Copy Number Analysis | — |
| SCAP | Spinocerebellar Ataxia Repeat Expansion Panel | — |
| SPUCU | Sputum Culture | — |
| SCCS | Squamous Cell Carcinoma, Serum | — |
| SSARO | SSA (52kD and 60kD) Antibody | — |
| ANASSB | SSB Antibody | — |
| STACHP | Stachybotrys chartarum/atra Panel | — |
| STCULT | Stool Culture to Methodist | Polymerase Chain Reaction |
| SWBCR | Stool WBC | — |
| STRWBY | Strawberry, IgE | — |
| PNEU14 | Strep pneumo Antibodies, IgG (14 Serotypes) | — |
| SPTSN | Strep pneumo Antibodies, IgG (23 Serotypes) | — |
| SPAG | Streptococcus pneumoniae Antigen, Urine | — |
| ASOR | Streptolysin O (ASO) Antibody | — |
| SGYG | Strongyloides Antibody IgG, Serum | — |
| YSTRYCS | Strychnine Screen | — |
| SUBP | Substance P, EIA | — |
| SFZ | Sulfamethoxazole, Serum | — |
| SULFU | Sulfate, 24 Hr. Urine | — |
| FSULF | Sulfatide Autoantibody Test | — |
| KIDN | Supersaturation Profile, Urine | — |
| SYCAMO | Sycamore Tree, IgE | — |
| SYNCU | Synovial Fluid Culture | — |
| SYNCAN | Synthetic Cannabinoid Metabolites, Qualitative, Urine | — |
| SYPAB | Syphilis Antibody, Total | Electrochemiluminescence Immunoassay |
