Used primarily in microbiological testing as a selective enrichment medium for the isolation of Staphylococcus species, particularly Staphylococcus aureus. The high salt concentration (7.5% NaCl) creates a selective environment that inhibits the growth of many bacteria while allowing salt-tolerant organisms like staphylococci to thrive. It is commonly used in food, pharmaceutical, and clinical laboratories to detect and confirm the presence of coagulase-positive staphylococci. Often serves as a pre-enrichment step before plating onto selective agar media such as Baird-Parker agar or Mannitol Salt Agar. Also used in quality control testing to assess the microbial safety of products and raw materials.