| YS100BP | S-100B Protein, Serum | — |
| YSCPA | Saccharomyces cerevisiae Antibodies, IgG & IgA | — |
| YSALI | Salicylate | Photometric Enzymatic Method |
| YSTYPHI | Salmonella typhi & paratyphi Antibodies | — |
| YFABRS | SARS-CoV-2, Influenza A/B & RSV Combo Test | — |
| YSCHAG | Schistosoma Antibody IgG, Serum | — |
| YSCLER | Scleroderma (Scl-70) (ENA) Antibody, IgG | — |
| YFSCPR | Scleroderma Comprehensive Profile | — |
| YSCLERD | Scleroderma Profile | — |
| YSECRET | Secretin | — |
| YESR | Sedimentation Rate | Manual Method Westergren |
| YSELEP | Selenium, Plasma | Quantitative Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) |
| YSELER | Selenium, RBC's | Quantitative Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) |
| YSELE | Selenium, Serum | Quantitative Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) |
| YSEMENA | Semen Analysis | Microscopy |
| YSEMBR | Semen Analysis w/WHO Morphology | — |
| YSPVC | Semen Post Vasectomy Check | Microscopy |
| YSPR3 | Serine Protease 3 Antibody | — |
| YSERQ | Seroquel (Quetiapine) | — |
| YHIAA | Serotonin (5HIAA), Urine, 24-hr | — |
| YSRAUH | Serotonin Release Assay (SRA), Unfractionated Heparin | — |
| YSSER | Serotonin, Serum | — |
| YSERO | Serotonin, Whole Blood | — |
| YSAA | Serum Amyloid A (SAA) | Electrochemiluminescence (MSD) |
| YSHBG | Sex Hormone Bind Globulin | Electrochemiluminescence Immunoassay |
| YTRIPCR | Sexually Transmitted Disease Panel 1 by TMA | — |
| YSZDIA | Sezary Diagnostic Flow Cytometry, Blood | — |
| YSHRIMP | Shrimp IgE | — |
| YSIKL | Sickle Cell Solubility Test | — |
| YSILWB | Silver, Whole blood | — |
| YSINQ | Sinequan (Doxepin) | — |
| YSINCU | Sinus Culture | — |
| YSIRO | Sirolimus Level (Rapamune), Blood | — |
| YSJAB | Sjogren (SSA & SSB) Antibodies | — |
| YSLPRPS | SLE Profile | ANAPN - Multiplex Flow Immunoassay; RFPS - Immunoturbidimetric Assay |
| YSDLDL | Small Dense LDL Cholesterol, Serum | — |
| YSMIT | Smith (ENA) Ab, IgG | — |
| YSMITRNP | Smith/RNP (ENA) Ab, IgG | — |
| YASMM | Smooth Muscle Antibody, IgG w/reflex | Semi-Quantitative Enzyme-Linked Immunosorbent Assay/Semi-Quantitative Indirect Fluorescent Antibody |
| YNA | Sodium | Ion-Selective Electrode, Direct Potentiometric Method |
| YNAK | Sodium & Potassium | Ion-Selective Electrode, Direct Potentiometric Method |
| YUNA | Sodium Urine, Random | Ion-Selective Electrode, Direct Potentiometric Method |
| YTNA | Sodium Values, 24 Hr. Urine | Ion-Selective Electrode, Direct Potentiometric Method |
| YFNAS | Sodium, Body Fluid | Ion-Selective Electrode, Direct Potentiometric Method |
| YSOFE | Sodium, Fecal | — |
| YRNEWSO | Solid Organ Recipient Re-Evaluation | — |
| YSTPP | Solid Tumor Precision Panel | — |
| YFBMN | Soluble Fibrin Monomer | — |
| YSLAAG | Soluble Liver Antigen Ab, IgG | — |
| YSTR | Soluble Transferrin Receptor | — |
| YSOMS | Somatostatin | — |
| YSOX1 | SOX1 Antibody, IgG by Immunoblot, Serum | — |
| YSOYBN | Soybean, IgE | — |
| YUSPG | Specific Gravity, Urine | — |
| YSMACNA | Spinal Muscular Atrophy (SMA) Copy Number Analysis | — |
| YSCAP | Spinocerebellar Ataxia Repeat Expansion Panel | — |
| YSPUCU | Sputum Culture | — |
| YSCCS | Squamous Cell Carcinoma, Serum | — |
| YSSARO | SSA (52kD and 60kD) Antibody | — |
| YANASSB | SSB Antibody | Multiplex Flow Immunoassay |
| YSTACHP | Stachybotrys chartarum/atra Panel | — |
| YSTON | Stone Analysis (Calculi) | Quantitative Reflectance Fourier Transform Infrared Spectroscopy / Quantitative Polarizing Microscopy |
| YCULTSTL | Stool Culture & E.coli Shiga-Like Toxin by EIA | Culture, Enzyme Immunoassay |
| YSWBCR | Stool WBC | — |
| YSTRWBY | Strawberry, IgE | — |
| YPNEU14 | Strep pneumo Antibodies, IgG (14 Serotypes) | — |
| YSPTSN | Strep pneumo Antibodies, IgG (23 Serotypes) | — |
| YSPAG | Streptococcus pneumoniae Antigen, Urine | — |
| YASOR | Streptolysin O (ASO) Antibody | Quantitative Nephelometry |
| YSTMR | Striated Muscle Antibodies, IgG with Reflex to Titer | Semi-Quantitative Indirect Fluorescent Antibody (IFA) |
| YSGYG | Strongyloides Antibody IgG, Serum | — |
| YSTRYCS | Strychnine Screen | High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) |
| YSUBP | Substance P, EIA | — |
| YSFZ | Sulfamethoxazole, Serum | — |
| YSULFU | Sulfate, 24 Hr. Urine | — |
| YFSULF | Sulfatide Autoantibody Test | — |
| YKIDN | Supersaturation Profile, Urine | — |
| YSYCAMO | Sycamore Tree, IgE | — |
| YSYNCU | Synovial Fluid Culture | Culture |
| YSYNCAN | Synthetic Cannabinoid Metabolites, Qualitative, Urine | — |
| YSYPAB | Syphilis Antibody, Total | Electrochemiluminescence Immunoassay |
