Inside an ISO 17025 Lab: How We Verify Every Batch
Published May 4, 2026
The Quick Answer
ISO/IEC 17025 is the international accreditation standard for testing and calibration laboratories — the gold standard for cannabis lab reliability. TP-G Farm sends every batch of flower, vapes, and pre-rolls to an ISO 17025-accredited third-party lab for testing on cannabinoids, terpenes, residual solvents, pesticides, heavy metals, and microbial contaminants. Every batch. Every COA public.
What ISO/IEC 17025 Actually Means
ISO/IEC 17025 is the global accreditation standard for testing laboratories, established by the International Organization for Standardization and administered nationally (in the U.S., by A2LA and IAS). To earn accreditation, a lab must demonstrate:
Technical Competence
Staff must be qualified and continuously trained on the specific analytical methods. Every technique — from HPLC (High-Performance Liquid Chromatography) for cannabinoid analysis to GC-MS (Gas Chromatography-Mass Spectrometry) for pesticide residue screening — must be validated against reference standards.
Reproducibility
The lab must produce consistent, repeatable results across multiple analysts, machines, and days. That's verified through blind proficiency testing where the lab receives unknown samples and must return correct results within tight statistical bounds.
Equipment Calibration
Every instrument must be calibrated at documented intervals against traceable reference materials. Uncalibrated equipment produces inaccurate numbers — that's disqualifying.
Data Integrity
Chain-of-custody documentation from sample intake to final report. Every sample gets a unique ID, every test result is time-stamped, and every analyst is documented. No shortcuts, no hand-editing of reports.
What Gets Tested on Every Batch
Cannabinoid Profile
HPLC quantifies THCa, Delta-9 THC, CBD, CBG, CBN, and 10-15 other cannabinoids at percent-of-weight precision. This confirms two things: the strain's cannabinoid character (potency and profile) and Farm Bill compliance (Delta-9 below 0.3%).
Terpene Profile
Headspace GC-MS identifies and quantifies 30+ individual terpenes. The top 5-8 by concentration define the strain's flavor and effect character (myrcene for sedation, limonene for uplift, pinene for focus, etc.).
Residual Solvents (Extracts)
For any solvent-extracted product, the lab screens for 20+ industrial solvents including butane, propane, ethanol, hexane, and acetone. Results should read "Not Detected." For live rosin (solventless), this is a compliance verification.
Pesticides
60+ agricultural chemicals across four categories: miticides, fungicides, insecticides, and plant growth regulators. Every result must read "ND" (Not Detected) or below regulatory limits.
Heavy Metals
Arsenic, cadmium, lead, and mercury. Cannabis is bioaccumulative — it absorbs metals from the soil. Contaminated soil produces contaminated flower; this test catches it.
Microbial Contaminants
Total yeast and mold count, aerobic bacteria, salmonella, E. coli, and mycotoxins. Rushed cures allow mold to develop; this test enforces cure quality.
What a Real COA Looks Like
A legitimate COA includes: lab name and ISO 17025 certification number, sample intake date, batch ID matching the product, cannabinoid table, terpene table, residual solvent panel, pesticide panel, heavy metal panel, microbial panel, and analyst signature. If any section is missing, or if the batch ID doesn't match the product, the COA is either incomplete or fraudulent.
Why We Do This
Third-party ISO 17025 testing costs $300-800 per batch. That expense sits inside the price you pay for premium hemp flower. But it's what separates products you can safely inhale from products of unknown provenance. TP-G Farm publishes every batch COA at labs.topgfarm.shop — every unit sold carries a batch code you can look up.
Keep exploring: Strawberry live resin gummies, Blue Raspberry live resin gummies, Pineapple live resin gummies, About TP-G Farm and contact us.
Frequently Asked Questions
The most-asked questions on this topic — answered in plain English.
ISO 17025 Testing
What does ISO/IEC 17025 mean for cannabis testing?
ISO/IEC 17025 is the international accreditation standard for testing laboratories — it certifies that a lab's methods, equipment, staff training, and data integrity meet globally-recognized quality standards. Cannabis brands that use ISO 17025-accredited labs deliver more reliable, reproducible results than brands using non-accredited testing.
How often should cannabis be tested?
Every batch, every time. A batch is a specific harvest or production run — different batches will have different cannabinoid percentages, terpene profiles, and potential contaminant risks. A brand that tests once and applies that COA across multiple batches is not delivering meaningful testing. Premium brands like TP-G Farm test every batch and publish every COA.
What tests should a hemp flower COA include?
Six sections at minimum: cannabinoid profile (including Delta-9 confirmation below 0.3%), terpene profile, residual solvents (for extracts), pesticides (60+ compounds), heavy metals (arsenic, cadmium, lead, mercury), and microbial contaminants (yeast/mold, aerobic bacteria, salmonella, E. coli). Missing any of these is a red flag.
Hemp-derived. Contains less than 0.3% Delta-9 THC. 2018 Farm Bill compliant. Not evaluated by the FDA. Not intended to diagnose, treat, cure, or prevent any disease. Must be 21+. Lab-verified — view COAs at labs.topgfarm.shop.
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