About GPT
A routine QC performance check performed on every newly prepared or purchased batch of culture media (both solid plates and liquid broths) before it is released for routine testing
Purpose of GPT
Verify Media Quality: Ensures the culture media lot supports the growth of target microorganisms at low levels.
Detect Inhibitory Factors: Guarantees there are no toxic substances or chemical imbalances in the media batch that could suppress microbial growth.
Regulatory Compliance: Essential for maintaining valid, audit-ready data in pharmaceutical, food safety, and clinical QC labs.
About GIT
A QC test specifically performed on selective culture media (media designed to support target pathogens while suppressing non-target organisms, such as MacConkey Agar or Cetrimide Agar).
Purpose of GIT
Confirm Selectivity: Ensures the media effectively inhibits non-target background flora that could overgrow or obscure target pathogens.Prevent False
Positives/Negatives: Verifies that selective agents (like bile salts, dyes, or antibiotics) are present at correct concentrations.
