Assay: In lab reporting, an assay is a test that measures how much of a substance is present in a sample. In cannabis, this often means the measured amount of THC, CBD or other cannabinoids in a batch.
Useful for reading COAs and understanding why labels have exact percentages or milligrams.
Common on product specifications, less common in NHS-facing patient materials.
Assay results are batch-specific and do not guarantee a particular patient response.