Which of the following is a common preanalytical error?

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Mislabeling of specimens is a common preanalytical error because it happens before any testing is performed and directly affects the identity of the sample. If a label is wrong or mismatched, the results can be attributed to the wrong patient or the wrong test, leading to incorrect diagnoses, inappropriate treatment, and the need for repeat testing. This type of error is frequent due to factors like high workload, multiple specimens, similar patient names, and labels being applied away from the patient or hurriedly. Preventive measures are built around strict patient identification at the collection site, labeling the specimen immediately in the patient area, and using barcoded labels that align with the patient’s wristband and order, ensuring the label and sample are matched before transport. Other issues like language barriers, a down LIS, or delayed results can cause problems but are not the classic preanalytical labeling error and involve different aspects of the workflow or IT, not the labeling step itself.