What are common reasons a specimen may be rejected by the lab?

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Specimen rejection happens when pre-analytical issues threaten the accuracy of test results or safety. The most common reasons labs reject a sample include mislabeling or missing identifiers, using the wrong specimen type for the requested tests, not having enough volume to perform all required analyses, visible hemolysis, leakage that compromises integrity, an improper container or additives that can alter results, and incorrect transport conditions or delays that allow degradation. These problems directly affect reliability, so the lab will reject the specimen to prevent erroneous results or unsafe handling. Relying on color alone isn’t a reliable acceptance criterion, and temperature or delay concerns are real factors in whether a specimen is acceptable. Statements that specimens are always accepted are not correct.