START WITH PURPOSE
What do you need the work to establish?
Begin with a written description of the sample and your analytical question. A precise inquiry gives the laboratory a better basis for confirming suitable work than a general request to “test quality.” Explain which results and documents you need.
CONFIRM THE SCOPE
Ask what is included—and what is not.
Discuss the available tests, the sample requirements and the way results will be reported. Do not assume that a request for one result also includes other measurements. Ask the laboratory to explain anything you do not understand before commissioning the work.
REVIEW THE DOCUMENTATION
Ask how the result will be delivered.
Discuss whether supporting output will accompany the COA, which sample references will appear and how recipients can retrieve the issued document. Ask about publication choices and the process for correcting a report.
CHECK THE BUSINESS DETAILS
Request current evidence where it matters.
When qualifications, accreditation or a specific method are important to your project, ask for current documentation and the applicable scope. Do not infer those details from a photograph, design style or general marketing statement.