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Salivary Gland Scan Scan, Cardiac Blood Pool Scan, Gallbladder Schwabach Test Scrotal Scan Scrotal Ultrasound (Testicular Ultrasound) Sedimentation Rate (Sed Rate) Seizure Medicine Levels in Blood Self-Examination for Dental Plaque Self-Test for Breath Alcohol Semen Analysis Sentinel Lymph Node Biopsy Serum Glutamate-pyruvate Transaminase (SGPT) Serum Glutamic Oxaloacetic Transaminase (SGOT) Serum Hexosaminidase A and B Serum Osmolality Serum Protein Electrophoresis (SPEP) Serum Protein Test SGOT (Serum Glutamic Oxaloacetic Transaminase) SGPT (Serum Glutamate-pyruvate Transaminase) Shoulder MRI Shoulder X-Ray Sickle Cell Test Sigmoidoscopy (Anoscopy, Proctoscopy) Sinus X-Ray Skin and Wound Cultures Skin Biopsy Skull X-Ray Sleep Apnea Study Sleep Studies Slit Lamp Examination Sodium (Na) in Blood Sodium (Na) in Urine Somatotropin Sonogram, Fetal Sonohysterogram Sperm Count Sperm Penetration Tests Spinal CT Spinal MRI (Magnetic Resonance Imaging) Spinal Tap Spinal X-Ray Spleen and Liver Scan Sputum Culture Sputum Cytology Stamp Test (for Erection Problems) Stomach Ulcer Test Stool Analysis Stool Antigen Test Stool Culture Stool Tests for Colorectal Cancer Stress Echocardiogram Stress Test Swallowing Study Sweat Test Synovial Fluid Analysis Syphilis Tests