Terpene Testing: How Profiles Are Measured and Reported

What a terpene profile is

A terpene profile is a list of the terpenes a laboratory found in a sample, usually with an amount for each. It describes one sample, from one batch, measured by one lab on one date by one method. It is not a property of a strain name. This page explains the measurement. It gives no "typical" percentages, because composition varies and verified batch data for any named cultivar is not available here.

How labs measure terpenes

• Gas chromatography (GC) is the long-standing approach. Studies in this area describe GC with flame ionization detection (GC-FID) as state of the art [1], and GC with mass spectrometry (GC-MS) for identifying many terpenes. One research method quantified 42 terpenes by GC-MS. [2] A study of 140 medicinal flowers on the German market also used GC-MS for each flower's terpene profile. [3]
• Liquid chromatography with mass spectrometry (LC-MS/MS) has also been validated, quantifying 16 terpenes and 7 cannabinoids including their acid forms in one method, with results comparable to GC-FID for 55 cannabis extracts. [1]
• Cannabinoids are usually measured in the same sample but by a different technique. See testing methods for how these methods work in general.

Why numbers differ between labs

• Methods may not be standardized. A large analysis of commercial flower from six US states noted that measurements are made by different labs using methodologies that may not be standardized, so differences between regions could be real or could come from the lab. [4]
• Units differ. Labs in that analysis reported results as percent of weight, parts per million or milligrams per gram and used GC-FID or GC-MS, so values had to be converted before comparing. [4]
• Isomers are handled differently. Some labs reported each isomer of a terpene such as nerolidol or ocimene and some reported one total. [4]
• Samples come from different sources. The samples in that analysis were submitted by cultivators for compliance testing. [4] See batch numbers and test dates.
• Many compounds are not fully identified. Cannabis resin contains hundreds of terpene and cannabinoid compounds, and many have not been conclusively identified. [5]

The terpene wheel and similar charts

Proper evidence not found for a validated, universally accepted "terpene wheel" or classification chart. A 2025 review describes developing a universal cannabis aroma and flavor wheel as a goal for the future. [6] Any wheel you see is not backed by the sources read for this page. Treat it as a way to organize smell vocabulary, and as a marketing claim when it is used to promise an effect.

Do names and labels predict a profile?

• Plants with the same name differ. In one study of plants from 32 seed sources, there was large variation in terpene profiles both within and between sets of plants labeled as the same cultivar. [7]
• Indica, sativa and hybrid do not map neatly. In 140 German medicinal flowers, there was no statistical correlation between terpene profiles and the genetic labels, and profiles within each label were quite heterogeneous. [3] In 89,923 US samples, commercial labels did not consistently align with the observed chemical diversity, though some labels had a biased association with certain chemotypes. [4] See why labels do not predict effects.
• Grouping by chemistry is possible. Researchers have grouped samples into chemovars by analyzing 28 major compounds [8], but that is a statistical grouping of samples, not a guarantee for the next batch.

So never infer a percentage, or a feeling, from a name. A number only has meaning when it comes with the batch, lab, date and method of its own lab report.

Flower versus concentrate

Terpenes are volatile and extraction changes the mix. A comparison found that monoterpenes were lost in a CO2 extract and the relative amounts of terpenes and cannabinoids differed significantly from the flower. [2] A concentrate's profile therefore cannot be read from the flower's.

What a profile does not tell you

A profile does not show how a product will affect you, whether it is contaminated, or whether it is safe. See why a COA does not prove effectiveness. Safety tests such as pesticides and solvents are separate reports; see how to read a COA.

Related guides

Terpenes in cannabis, Added Terpenes vs Natural Profiles and Terpenes vs Cannabinoids. This page is information only.