Which of the following is a reason a specimen may be rejected?

Using expired tubes is a valid reason for rejecting a specimen because the integrity and reliability of the test results can be compromised if the tubes are not within their expiration date. Expired tubes may not perform as intended, potentially affecting the preservation of the specimen or the reactions required for accurate testing. This can lead to erroneous results that could impact patient diagnosis and treatment.

In contrast, correct labeling and identification, proper handling and timely delivery, and sufficient volume of specimen are critical components that ensure the validity and usability of a specimen. Specimens that are correctly labeled and identified avoid mix-ups, while proper handling and timely delivery prevent degradation of the sample. Moreover, having a sufficient volume of specimen is crucial for performing the required tests without the need for repeat collection, which could delay diagnosis or therapeutic interventions.