Trust

Methodology

Everything here is either verified public data or clearly-framed buyer education. We do not fabricate credentials, accreditations, statistics, case counts, ratings, or reviews.

Lab reference data

The 34 labs in the reference layer are real, publicly-documented testing, inspection, calibration, and certification companies. Each record was researched and then independently re-verified via web search before publication, with source URLs recorded. Only large, nationally or globally recognized, or well-documented specialist firms are included; we do not invent or list unverifiable local labs.

Accreditation claims

Real, named standards and accreditation bodies (ISO/IEC 17025, ASTM, A2LA, ANAB, ASNT, and others) are referenced factually as industry context on our guide pages. We never state that a specific listed lab holds a specific accreditation or certification unless a real, cited source for that lab explicitly says so. Missing data renders as missing, never guessed. Specialty Labs Index does not itself certify, verify, or accredit any lab.

Search demand

Guide priority and the demand figures shown on category pages come from Ahrefs keyword data for the United States. Where we did not pull a reliable figure for a term, we show no number rather than guess one.

Lab sourcing guides

Each guide is buyer education: what the lab does, what to verify, what to ask in an RFP, and the red flags. Every guide passed an adversarial fact-check pass whose job was to remove any invented statistic, unverifiable certification, fake standards body, or implication of a safety, engineering, or legal guarantee. Standards and governing bodies are named only where they genuinely exist and are current. Verify any credential directly with the issuing body.

What we will not do

• No fabricated credentials, accreditations, case counts, or lab counts.
• No fake reviews, ratings, testimonials, or fabricated "verified" claims. A paid Verified listing (see Get listed) means KG manually confirmed the business's identity and the accuracy of its own listing facts, nothing more. It is not a customer review, a star rating, a quality score, or an endorsement of the lab's work.
• No Review or AggregateRating structured data, because no real moderated customer reviews exist here.
• No claim that any lab is suitable for your project, or that any method meets code or spec. That is your call, made with qualified professionals.

Freshness and corrections

Data is current as of 2026-07-14. Spotted an error in a lab profile or a guide? Email hello@specialtylabsindex.com and we will correct or remove it.