Two labels, considerable variation
Commercial indica and sativa labels are poor predictors of a cannabis sample's overall genetics and chemical composition. A 2021 study involving Dalhousie University, Wageningen University & Research and Bedrocan analysed hundreds of samples and found that the familiar distinction did not divide them into two dependable chemical groups. The labels remain common vocabulary, but the variation within them is substantial. A name on its own therefore offers far less chemical detail than its apparent simplicity suggests.
Aroma supplied part of the signal
The researchers did find a limited relationship with certain aromatic compounds. Samples labelled sativa tended to contain more terpenes associated with fruity or tea-like aromas, while indica-labelled samples tended toward compounds associated with earthy smells. A small number of genomic regions were associated with that earthy aromatic character. This provides a plausible explanation for part of the labelling pattern: sensory impressions may have influenced names. An association with selected aromas is much narrower than a complete classification of a plant's chemistry.
A strain name is another layer
The study also found that pairs sharing a strain name could differ genetically and chemically as much as pairs with different names. A commercial name and an indica or sativa category therefore represent two separate naming conventions, neither of which establishes the exact composition of a sample. Chemical identity involves individual compounds and their concentrations. The same general description can cover samples whose measured profiles differ, which is especially relevant when research requires reproducible material.
What a measured profile adds
Laboratory analysis can report particular cannabinoids and other compounds in the sample tested. NIST's 2024 hemp reference material provides a shared benchmark for laboratories measuring cannabinoids and toxic elements, helping connect reported concentrations to a known comparison material. Such measurements answer a more specific question than a broad label: what was present in this sample, and in what amount? Indica and sativa belong to the language of cannabis classification; a laboratory profile describes the material itself with finer resolution.
Sources & further reading
General information, not individual legal or medical advice.