Top pick: Total THC. If you read one line of a cannabis certificate of analysis (COA), read that one. It is the figure most state regulators use to judge potency and label accuracy, and it tracks the experience better than any other number on the page. Every term below is sorted on the same three criteria: does the value change what you feel, does a regulator attach a hard limit to it, and can you confirm it in under a minute while standing at a counter.

Medical Cannabis Label Dosage Info: Understanding the Basics

Total THC, THCA, and Delta-9 THC: the potency terms

Raw flower holds most of its THC as THCA, the acid form that does not produce a high until heat converts it. Reports list Delta-9 THC (the active form), THCA, and Total THC, which is Delta-9 THC plus roughly 87.7 percent of the THCA weight to account for the mass lost during decarboxylation. A jar marketed as 30 percent THC and a report showing 24 percent Total THC can describe the same flower under two different math conventions.

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Pros

how to read cbd label cannabis products

• Total THC anchors potency caps and label accuracy rules in most legal markets, so it is the number a regulator would check.
• It carries across flower, vape oil, edibles, and concentrates, which makes comparisons possible.
• It exposes the gap between a marketing claim and a measured result.

Cons

What Does Harvest Date Mean on a Cannabis Label?

• It merges two molecules with different effects, so a high Total THC figure can still mean a product with little already-active Delta-9 THC.
• The percentage shifts with moisture, and dry-weight results are not the same as as-is results.
• One cultivar name spans many lots, and potency moves between them.

Use it when you are comparing packages side by side or fact-checking a label. For edibles, read milligrams per serving instead of percentage, since a 10 mg serving is a fixed dose no matter what the flower percentage says.

ND, LOQ, and action limits: reading what a test can and cannot see

ND means not detected. It does not mean zero. Every method has a limit of quantitation (LOQ), the smallest amount the instrument can measure with confidence, and ND means the result landed below that line. An action limit is the threshold a state sets for a given contaminant. A result above the action limit fails the batch; a result below the LOQ is reported as ND.

Pros

• A clean panel with a tight LOQ stated is a stronger signal than a bare pass or fail stamp.
• Action limits give you an objective line that does not depend on marketing language.

Cons

• A lab running a loose LOQ can report ND for a pesticide at a concentration a stricter lab would flag.
• ND on one panel says nothing about another panel, so a clean solvent result tells you nothing about mold.

Use it when you are buying inhalables, especially vape cartridges and concentrates, where residual solvents and pesticides carry the most weight.

Safety panels: pesticides, heavy metals, residual solvents, microbials, mycotoxins

Each panel uses its own method and its own limit, and states differ on which panels they require. Microbial testing covers mold, yeast, and bacteria such as Aspergillus. Mycotoxin testing covers aflatoxins and ochratoxin A. Residual solvent testing covers the chemicals used to make extracts, and heavy metal testing covers lead, arsenic, cadmium, and mercury.

Pros

• These panels catch contamination you cannot see or smell.
• They are the one part of a COA tied to a defined regulatory limit in most legal markets.

Cons

• Requirements vary by state, so a short report may reflect a lenient rule rather than a clean product.
• A pass applies to the sample the lab received, not to every gram in the facility.

Use it when the product is inhaled, the extract was made with solvents, or the flower was grown in a humid climate where mold risk runs higher.

Terpenes and total terpenes

Terpenes are the aromatic compounds behind smell and much of the character people describe as strain effect. Reports list individual terpenes such as myrcene, limonene, and pinene, plus a total terpene percentage by weight.

Pros

• A terpene panel separates two products that share the same Total THC figure.
• It gives you a concrete way to shop for aroma instead of trusting a name.

Cons

• Terpene testing is optional in some states, so a missing panel is common.
• Values fall during storage, and added botanical terpenes may not be labeled differently from cannabis-derived ones.

Use it when potency numbers between two options are close and you want a tiebreaker.

Moisture, water activity, and foreign matter

Moisture content describes how much water sits in the flower. Water activity describes how much of that water is available to microbes, which makes it the better predictor of spoilage. Foreign matter testing, sometimes called filth testing, screens for mold, hair, insect fragments, and other material that should not be there.

Pros

• Water activity predicts shelf life and mold risk before you see mold.
• Moisture content tells you whether flower will smoke harsh or hold up in a jar.

Cons

• Neither number compares across labs unless the method matches.
• Moisture drifts down after packaging, so a fresh report can age out of accuracy.

Use it when you buy flower by the ounce and plan to store it.

Metadata: batch number, harvest date, test date, and lab accreditation

The header carries as much value as the numbers. A COA without a batch or lot number that matches your package cannot be tied to your product, which makes the rest of the page decoration. Harvest and test dates show age, and ISO/IEC 17025 accreditation means the lab has been audited against an international standard for testing and calibration labs.

Pros

• A matching lot number is the single easiest way to confirm a report belongs to your package.
• Accreditation and test dates tell you how much trust the document can carry.

Cons

• Not every state requires accreditation, and not every dispensary posts the full report.
• A QR code can lead to a report for a different lot from the same brand.

Use it when a QR code or a printed sheet is the only testing information you have.

The convenience test: three lines worth your time

Convenience shapes buying in this category. Shoppers reach for pre-rolls, gummies, and vape pods, and the testing tab is the last thing anyone opens. That makes a short routine more useful than a full read of a dense PDF.

1. Match the batch or lot number on the report to the package in your hand. No match, no signal.
2. Find Total THC and, for edibles, milligrams per serving. This is the line most likely to conflict with the label.
3. Scan the safety panels for ND results and check whether the report states an LOQ or action limit. A limit shown is a report you can compare against another.

The terms that matter most are the ones tied to a regulatory limit, a stated method, and a number you can hold next to another number. Total THC, a matched batch number, and a clean safety panel with visible limits cover the bulk of what a buyer needs to know before the label claim gets the final say.