When is it necessary to repeat a specimen collection?

Repeating a specimen collection is necessary when the initial specimen is found to be compromised. Compromise can occur due to various factors such as contamination, improper handling, or storage errors that could affect the accuracy of test results. If the integrity of the specimen is questionable, it is crucial to obtain a new sample to ensure reliable and valid test outcomes.

The other circumstances listed—collecting multiple specimens, minor delays in processing, and patient requests—do not inherently necessitate a repeat collection. For instance, collecting more than three specimens might be part of a specific testing protocol, but it does not imply that a new collection is needed simply based on quantity. Similarly, a minor delay in processing may not compromise the specimen itself if it remains within acceptable time limits for the specific type of test. Lastly, while a patient's request might warrant consideration, it does not automatically necessitate repeating a specimen unless there are specific concerns about the original sample's validity.