Which of the following is a common pre-analytical error source?

• A. Using the Correct Tube Type
• B. Mislabeling
• C. Adequate Sample Volume
• D. Proper Handling

Answer: (B)

Mislabeling hits at the critical identification step before any analysis is done. In the pre-analytical phase, the specimen must be correctly linked to the right patient and the right test. If a label is wrong or swapped, the result belongs to the wrong person, or the wrong tests are claimed for the patient, leading to dangerous diagnostic mistakes and inappropriate treatment. This makes mislabeling a common and especially problematic pre-analytical error, because labeling happens at collection under time pressure, with similar names, multiple samples, and the need to match patient identifiers and test orders exactly.

Using the correct tube type, ensuring an adequate sample volume, and handling the specimen properly are all good practices that prevent errors; when these are done correctly, they support accuracy rather than cause errors.