- SAAG (Serum Ascitis Albumin Gradient)
- SCL-70 Antibody
- Scrub Typhus IgM
- Semen Analysis
- Sex Hormone Binding Globulin (SHBG)
- Sickling test
- Sm/RNP Antibody
- Smear for Fungal Elements
- Sodium
- Sputum for Malignant Cells
- Squash Cytology
- Stool Examination
- Stool for Occult Blood