# How To Read Lab Results And COAs Behind Product Claims

> Not all lab results tell the full story. The Wellness Quality Institute shows you how to read COAs and defend every product claim. Start reading now.

**Published:** 2026-09-06 | **Updated:** 2026-10-31 | **Author:** renatoloureiro
**URL:** https://www.wellnessqualityinstitute.com/articles/third-party-lab-results-claims
**Type:** post

**Categories:** Certification

![How To Read Lab Results And COAs Behind Product Claims](https://wellnessquality.sites.aigrowthagent.co/wp-content/uploads/sites/93/2026/09/1787736699923-a8c12190701f-1024x572.webp)

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## Content

*Written by: Scott Steveson, Specialist, Wellness Quality Institute | Last updated: October 16, 2026*

## Key Takeaways

- A certificate of analysis (COA) is a laboratory report of findings. It can still fail to support the product claims printed on the label.
- Defensible third-party testing uses an accredited independent laboratory, a named method, stated reporting limits, blank controls, and a matching lot number.
- “None detected” is always limited by the instrument’s detection floor, the polymers screened, and the specific lot tested.
- Misleading results often stem from blank contamination, methods that do not fit the product, detection floors set too high, or incomplete polymer panels.
- The Wellness Quality Institute uses Plastic-Free Pathway Verification to review existing lab data so brands can make claims that match their evidence.

[Get independent review of your lab data.](https://www.wellnessqualityinstitute.com/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)

## How Lab Tested, Third-Party Tested, And WQI Verification Compare

“Lab tested” often means the manufacturer’s own lab, which is similar to grading your own homework. In-house testing uses the company’s staff, equipment, and procedures. It can guide internal quality decisions, yet the analyst and the institution still share a financial interest in a favorable result. [One analysis of third-party testing practice](https://aresresearchlab.com/blog/benefits-of-third-party-lab-testing-for-researchers) found that 84% of retailers consider independent verification extremely important because of this built-in conflict.

![Scientists in white coats working with samples and microscopes in a laboratory.](https://cdn.aigrowthmarketer.co/1784829434095-0fc8fbcf29fa.webp)**Only a small number of laboratories can genuinely test for microplastics, and capability varies by instrument and method. WQI reviews a company's existing third-party laboratory data against a defined standard — it does not run the tests itself.**

Independent third-party testing adds separation because an outside laboratory performs and reports the analysis. The phrase “third-party tested” by itself still does not prove independence, competence, or reliable claims. [Some suppliers use affiliated or financially connected labs](https://aresresearchlab.com/blog/benefits-of-third-party-lab-testing-for-researchers) that look separate on paper but do not meet the independence standards that accreditation requires.

A defensible COA clearly identifies the laboratory, analytical method, detection limits, sample identifier, test date, and the exact product lot or batch tested. Without those elements, “third-party tested” remains a loose process description instead of a verifiable claim.

The table below shows where each approach leaves a gap. In-house testing carries a conflict of interest. Third-party testing can still lack methodological independence. WQI verification adds an independent review layer that connects a lab report to a claim you can defend.

| Attribute | In-House Lab Testing | Third-Party Lab Testing | WQI Verification |
| --- | --- | --- | --- |
| Who performs the analysis | Manufacturer’s own staff | Independent laboratory | WQI reviews existing third-party data |
| Conflict of interest | Analyst and institution share interest in favorable result | Laboratory paid for work, not outcome | WQI has no commercial interest in outcome |
| Accreditation basis | Not applicable | ISO/IEC 17025 or California ELAP (as an example of a state program) | Reviews laboratory qualification tier |
| Public accountability | None | COA issued by laboratory | Public registry listing with registry ID |

*Each data point in this table reflects Wellness Quality Institute (WQI) published criteria and standard laboratory practice. No external statistics are cited because the table describes process attributes, not measured outcomes.*

## What A Defensible Certificate Of Analysis Must Show

A COA only has evidentiary value for the tests it documents. [Treat a COA as evidence to evaluate](https://labmanager.com/five-questions-to-ask-before-accepting-a-supplier-certificate-of-analysis-36078) instead of a badge to accept. The elements below determine whether a COA can support a defensible claim.

1. **An accredited laboratory.** Look for [ISO/IEC 17025:2017](https://wholesomefraction.com/learn/iso-17025-lab-testing) accreditation or California ELAP accreditation for the specific microplastics method. Accreditation covers a defined scope of tests. Confirm that the exact test appears within that scope, not just that the lab holds a certificate.
2. **The analytical method named.** A COA that omits the method tells you very little. The method sets what the result can support, including which particle sizes or analytes it can detect and which it cannot.
3. **Reporting limits stated.** A “none detected” result is bounded by the method’s detection capability, which is the smallest amount the instrument can reliably measure. Without a stated reporting limit, you cannot interpret the result. “None detected” never automatically means “none present.”
4. **Blanks and contamination controls reported.** Blank controls are samples that contain no target analyte and run under the same conditions as test samples. They reveal contamination introduced by the process itself. [Quality frameworks such as CLSI EP17-A2 require blank controls](https://aresresearchlab.com/blog/why-blank-controls-matter-in-laboratory-testing). When a blank measurement exceeds the limit of blank threshold, the analytical batch is flagged and must not be reported. A contaminated procedural blank can invalidate an otherwise impressive result.
5. **The lot or batch number matching the product.** The lot number on the product should match the lot number on the COA. [Batch mismatch](https://oplabs.co.uk/what-makes-a-certificate-of-analysis-trustworthy) is likely the most common real-world failure mode for COAs. A report for a different batch tells you nothing about the batch in hand.
6. **Chain of custody.** Chain of custody documents the sample’s path from production through shipment, receipt, handling, and analysis. [This record helps show that the tested material matches the product behind the public claim](https://aresresearchlab.com/blog/benefits-of-third-party-lab-testing-for-researchers).

[Learn what microplastics lab results actually mean for your product](https://www.wellnessqualityinstitute.com/articles/independent-review-lab-results-microplastics/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)

## Why Some Lab Results Look Clean Yet Mislead

Several recurring issues drive misleading COA results in microplastics and consumer products. Each one can produce a clean-looking report while leaving the core safety or content question unresolved.

**Blank contamination.** Blank controls must run under the same conditions as test samples. [Frameworks such as CLSI EP17-A2 treat blanks as essential](https://aresresearchlab.com/blog/why-blank-controls-matter-in-laboratory-testing). Without them, laboratories cannot separate true analyte signals from background interference. A 2024 PNAS nanoplastics study illustrates this risk. [A later PNAS commentary reported contaminated procedural blanks and weak quality control](https://www.pnas.org/doi/10.1073/pnas.2411099121), which cast doubt on the original headline figure of roughly 240,000 plastic particles per liter of bottled water [reported in the study](https://www.pnas.org/doi/10.1073/pnas.2300582121). The critique centered on blank controls, the same contamination checks that any defensible COA should disclose.

![Fragments of plastic suspended in blue water below the surface.](https://cdn.aigrowthmarketer.co/1784829388732-c6255482b477.webp)**Plastic doesn't disappear — it fragments. These secondary microplastics are the breakdown products of everyday objects, and independent research now detects them across the water supply. Detection, though, establishes presence, not absence.**

**A method that does not fit the product matrix.** [A method must be validated for both the matrix and the analyte](https://scispx.com/wikispx/how-does-sample-preparation-affect-elemental-analysis-results). Matrix effects occur when the composition of the prepared sample suppresses or enhances the instrument signal compared with a pure standard. The same analyte level can then appear higher or lower depending on what else sits in the sample.

**A detection floor set too high.** The detection floor, or reporting limit, is the smallest particle size or concentration the method can measure reliably. A method that starts at 50 micrometers (µm) cannot see anything smaller. “None detected” can therefore sit alongside particles that exist below that size. The result stays technically accurate while remaining practically incomplete.

**An incomplete polymer panel.** No single test screens every polymer type. Plastics include polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), PVC, and nylon, among others. [A COA only reports the tests that ran](https://jefluo.com/articles/tds-coa-qualification-document-role/). Any polymer type outside that panel remains unknown. The scope reflects the inspection parameters for that supply relationship instead of a universal full panel.

[Learn how to evaluate plastic lab results for your product](https://www.wellnessqualityinstitute.com/articles/independent-review-lab-plastic-data/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)

## Why “None Detected” Has Built-In Limits

California defines microplastics in drinking water as solid polymeric material with particles that have at least three dimensions greater than 1 nanometer and less than 5,000 micrometers. This definition is intentionally broad and extends beyond what current analytical methods can measure reliably.

![Colorful plastic fragments in water inside a laboratory petri dish.](https://cdn.aigrowthmarketer.co/1784829410323-fb401fc7b1e4.webp)**Microplastics are particles smaller than five millimeters. Current methods can count and identify them at the upper end of that range, but reliable measurement falls away as particles get smaller — a limit that shapes every honest claim.**

Two published analytical methods sit under California’s framework, each with its own validated detection range:

- **SWB-MP1-rev1**, which uses infrared spectroscopy and is validated above 50 µm through 5,000 µm.
- **SWB-MP2-rev1**, which uses Raman spectroscopy and is validated above 20 µm through 5,000 µm.

[These two standardized methods were validated through a 22-laboratory study](https://waterverge.com/news/ucmr6-microplastics-monitoring) and remain the strongest public reference for this testing. The regulation contemplates particles down to 1 nanometer. The best validated methods start at 20 or 50 micrometers, which are thousands of times larger. The 1–20 µm fraction appears in California’s framework but is not covered by either validated reporting method. Everything below that range currently sits beyond reliable commercial measurement.

“None detected” therefore means none found above the instrument’s detection floor for the polymers screened in the lot tested. It means none were found above that threshold, yet it does not rule out their presence below it.

## Purity Figures And What They Leave Out About Safety

A purity figure, such as a 99% HPLC purity result, measures concentration. It does not measure sterility, safety, or whether the product works. A single COA number cannot carry all of those meanings at once.

[Chromatographic purity describes the relative composition of detected components](https://labmanager.com/five-questions-to-ask-before-accepting-a-supplier-certificate-of-analysis-36078). It does not prove identity, exact quantity, sterility, stability, or the absence of untested contaminants. Water, inorganic impurities, and residual solvents usually require separate tests. A material can show high chromatographic purity yet contain much less of the target compound by weight.

Purity, assay, and content describe different concepts. [A COA records measurements instead of issuing a safety verdict](https://wholesomefraction.com/learn/iso-17025-lab-testing). It tells you what one batch contained relative to the limits the lab screened for. A clean purity figure does not prove that the product is safe, effective, or free of untested contaminants. It shows what the detector recorded under those conditions for the analytes it was set up to find.

## From Report To Claim: Why Independent Review Matters

A lab report by itself does not become a defensible market claim. Self-reported results carry less weight than independently reviewed data. Without independent review, even rigorous data often looks like marketing.

The Federal Trade Commission’s enforcement action against TruHeight in April 2026 illustrates this point. [The company relied on a single company-sponsored study of 32 subjects](https://ftc.gov/business-guidance/blog/2026/04/protecting-kids-deceptive-unsubstantiated-health-claims-ftcs-case-against-truheight), which the FTC found insufficient to support “clinically proven” claims. The agency expects claims to match the strength and scope of the evidence. A COA that reports what a tested sample contained cannot replace evidence that supports the full marketing claim.

The same logic applies to microplastics. As explained earlier, a “none detected” result is bounded by the method’s detection floor and the lot tested. Independent review adds the interpretive layer that many brands lack. It clarifies what the data actually supports and which claim language stays inside that boundary.

The Wellness Quality Institute Plastic-Free Pathway Verification (PFPV), governed by WQI-CS-01, provides this independent review. The Wellness Quality Institute evaluates a company’s existing laboratory dataset, method, product scope, and supporting controls against defined criteria. Because the Wellness Quality Institute does not run laboratory tests, it does not verify that any product is free of plastic. Instead, a single assessment fee covers the review, verification decision, and registry listing, with no separate mark-license or registry fee. Independent laboratory testing is arranged and billed separately by a qualified independent laboratory.

Every Standard Met outcome includes a public registry listing and registry ID so any customer, retailer, or journalist can see exactly what was reviewed. Verification stays locked to the reviewed product, dataset, tested particle-size range, polymer panel, and production period. A Standard Not Met outcome remains private and is never described as a failed product.

The Wellness Quality Institute criteria align with the California State Water Board drinking-water microplastics reference framework. This serves as a technical reference point rather than a geographic boundary. Verification is available to companies across the United States.

*Plastic-Free Pathway Verification does not certify that a product contains zero plastic, microplastics, or nanoplastics. It shows that the company follows a verified pathway toward plastic-free standards. Verification applies only to the reviewed products, submitted datasets, tested ranges, polymer panels, production or sampling periods, and supporting controls. Wellness Quality Institute verification is not a California approval, government certification, or health or safety certification.*

[See how WQI turns lab reports into defensible claims.](https://www.wellnessqualityinstitute.com/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)

## How To Verify A Product Claim In 7 Steps

1. **Identify the claim.** Pin down the exact statement. “Third-party tested” describes a process. “No microplastics detected” is a claim that needs evidence.
2. **Find the supporting lab report.** Once you know the claim, locate the COA that backs it up. A claim without a report is only an assertion, and a report without a lot number cannot be tied to the product in hand.
3. **Check the laboratory’s accreditation.** Confirm that the lab holds [ISO/IEC 17025](https://wholesomefraction.com/learn/iso-17025-lab-testing) or California ELAP accreditation for the method used. Make sure the specific test appears within the accredited scope.
4. **Check the method and its validated range.** Note which method the lab used and what particle-size range it covers. The 1–20 µm fraction is not validated under either California method, and everything below 1 µm currently sits beyond reliable commercial measurement.
5. **Check the reporting limits and blanks.** A “none detected” result without a stated reporting limit cannot be interpreted. Blank data should appear alongside sample results so you can see whether contamination affected the batch.
6. **Confirm the lot number matches.** Match the lot number on the product to the lot number on the COA. A report for a different batch tells you nothing about the product you hold.
7. **Confirm the claim stays inside the reviewed scope.** A single product’s result cannot justify a product-line or company-wide claim. Scope lock keeps a defensible claim defensible.

[Five questions to ask when choosing a microplastics lab](https://www.wellnessqualityinstitute.com/articles/third-party-microplastics-testing-guide/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)

## Frequently Asked Questions

### What Is The Difference Between Lab Tested And Third-Party Tested?

“Lab tested” can refer to the manufacturer’s own lab, where the analyst and institution share an interest in a favorable result. As explained earlier, that conflict limits what the finding can support in a public claim. Third-party testing means an independent laboratory with no ownership ties to the brand ran the analysis and is paid for the work, not the outcome. The phrase “third-party tested” still needs context. Look for a named laboratory with verifiable accreditation, a stated method, and a lot number that matches the product.

### Is Third-Party Lab Testing Enough On Its Own?

Third-party testing usually improves on in-house testing, yet the phrase alone does not prove independence, competence, or reliable claims. A defensible third-party result comes from an accredited laboratory using a method validated for the product matrix, with stated reporting limits, blank controls, and a matching lot number. Without those elements, “third-party tested” remains a process description instead of a verifiable finding.

### What Can Cause False Or Misleading Lab Results?

The main causes appear earlier in this article. Blank contamination, matrix effects, high detection floors, and incomplete polymer panels account for most misleading results. Together, they can create a report that looks clean while leaving key questions unanswered.

### Does A COA Prove A Product Is Safe?

A COA documents what a specific sample was tested for, which method the lab used, and what the lab found. It is a report of findings rather than proof of safety, efficacy, or absence. The result is bounded by the method’s detection capability, the analytes screened, and the lot tested. As noted earlier, a “none detected” result is limited by the instrument’s floor and the lot in question. The key issue is which claim that bounded finding can support.

### How Long Does Wellness Quality Institute Verification Last?

Wellness Quality Institute verification lasts 24 months from the sampling date of the most recent accepted dataset. Continued claim use after that period requires re-verification with current data. This approach reflects lot-to-lot variability, because each result reflects the production it came from. Expired registry entries remain visible and marked “Expired” so the public record stays honest over time.

### Does Wellness Quality Institute Verification Replace Legal Or Advertising-Claims Review?

Companies remain responsible for making sure all product, packaging, and marketing claims are accurate and properly substantiated. Wellness Quality Institute verification reviews a dataset against a defined standard. It does not replace legal, regulatory, or advertising-claims counsel.

[Talk to WQI about Plastic-Free Pathway Verification.](https://www.wellnessqualityinstitute.com/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)

## Conclusion: Turning Lab Reports Into Claims You Can Defend

A COA can look legitimate and still mislead because it records what was found instead of proving what is absent. Learning to read third-party lab results critically means checking the method, detection range, polymer panel, blank controls, chain of custody, and scope. That is the difference between a claim you can defend and a claim you hope survives scrutiny.

The gap between a lab report and a defensible market claim is real and often overlooked. Many brands already hold useful laboratory data. They lack a trusted way to turn that data into clear, accurate claims. As noted earlier, a “no microplastics detected” report reflects the method’s floor, the polymers screened, and the lot tested. Without independent review, that bounded finding can be misread by the brand, the market, or anyone challenging the claim.

Plastic-Free Pathway Verification from the Wellness Quality Institute provides the independent review layer between a lab report and a defensible claim. The Wellness Quality Institute has no commercial interest in the outcome and does not run the tests it reviews. Every Standard Met outcome includes a public registry listing and registry ID so anyone can see exactly what the verification covers.

*Plastic-Free Pathway Verification does not certify that a product contains zero plastic, microplastics, or nanoplastics. It shows that the company follows a verified pathway toward plastic-free standards. Verification applies only to the reviewed products, submitted datasets, tested ranges, polymer panels, production or sampling periods, and supporting controls. Wellness Quality Institute verification is not a California approval, government certification, or health or safety certification.*

[Explore Plastic-Free Pathway Verification for your products.](https://www.wellnessqualityinstitute.com/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)

## Read Next

- [How to Verify Plastic-Related Claims Using Lab Data](https://www.wellnessqualityinstitute.com/articles/verify-plastic-free-claims-lab/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)
- [What Should Be Included in the Analysis of a Lab Report](https://www.wellnessqualityinstitute.com/articles/evaluate-lab-reports-for-marketing/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)
- [How To Evaluate Lab Results for Plastic Marketing Claims](https://www.wellnessqualityinstitute.com/articles/independent-lab-results-marketing-claims/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)
- [Turn Plastic Lab Data into Registry-Backed CPG Claims](https://www.wellnessqualityinstitute.com/articles/third-party-verification-cpg-suppliers/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)
- [How To Verify Existing Lab Data on Plastic Content Claims](https://www.wellnessqualityinstitute.com/articles/verify-laboratory-data-plastic-content/?utm_term=third-party-lab-results-claims&utm_campaign=ai_growth_agent)

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## Structured Data

### BlogPosting

- **Headline:** How To Read Lab Results And COAs Behind Product Claims
- **Description:** Not all lab results tell the full story. The Wellness Quality Institute shows you how to read COAs and defend every product claim. Start reading now.
- **DateModified:** 2026-10-16T11:22:59.201Z
- **Image:** https://cdn.aigrowthmarketer.co/1784829434095-0fc8fbcf29fa.webp, https://cdn.aigrowthmarketer.co/1784829388732-c6255482b477.webp, https://cdn.aigrowthmarketer.co/1784829410323-fb401fc7b1e4.webp
- **InLanguage:** en-US
  **Person:**

  - **Name:** Scott Steveson
  - **JobTitle:** Specialist
  - **Description:** Scott Stevenson is part of the Wellness Quality Institute team, where he supports WQI’s work to advance product transparency, credible verification, and greater consumer trust. His background spans ethics and compliance, corporate trust, and responsible business, including experience with Ethisphere Institute and global companies navigating evolving standards and stakeholder expectations.
    **Organization:**

    - **Name:** Wellness Quality Institute
    - **Url:** https://www.wellnessqualityinstitute.com/
  **Organization:**

  - **Name:** The Wellness Quality Institute
  - **Url:** https://wellnessqualityinstitute.com

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## Citations

- [How To Verify Plastic Contamination In Protein Powder](https://www.wellnessqualityinstitute.com/articles/verify-protein-powder-plastic-contamination)
- [Plastic Claim Substantiation: Evidence Before You Claim](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-evidence-requirements)
- [How To Make Plastic Reduction Claims That Hold Up](https://www.wellnessqualityinstitute.com/articles/substantiate-clean-label-plastic-reduction)
- [Plastic Claim Substantiation: A US Compliance Guide](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-compliance-guide)
- [Microplastics Verification Standards: A Complete Guide](https://www.wellnessqualityinstitute.com/articles/microplastics-verification-standards-guide)

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