A laboratory report is a record of a particular investigation. Before looking at its headline result, establish what was examined, which question was asked and where the document came from. Reading these details together prevents a number from becoming separated from the context that gives it meaning.
Start with the document and sample
Find the issuing organisation, report identifier, issue date and sample description. Compare sample or batch codes with the associated records. Similar names are not enough to establish that two documents concern the same sample. Keep the complete original file, including notes and supplementary pages, rather than relying on a cropped screenshot.
Read the method beside the result
Locate the method name, units and explanatory notes. Ask whether the measurement answers the question you actually have. A result for one property does not automatically describe other properties. If a specification appears, distinguish that comparison criterion from the measured result.
Record unresolved questions
Write down missing information instead of filling gaps with assumptions. Which sample does this cover? What does the abbreviation mean? Is there a revised report? Ask the issuer for clarification where appropriate.
Create a faithful summary
Use three headings in your reading note: what the report states, what it does not establish, and what needs clarification. This keeps your summary proportionate to the evidence and makes it easier for another reader to review your reasoning.