Which of the following is NOT typically a pre-analytical error source?

• A. Mislabeling
• B. Hemolysis
• C. Incorrect Tube Type
• D. Adequate Sample Volume

Answer: (D)

Pre-analytical errors are problems that occur before the lab analysis, typically during collection, labeling, handling, or transport of the specimen. Mislabeling can cause patient mix-ups and wrong results, and hemolysis often results from rough handling or improper technique, both of which can seriously skew test outcomes. Using an incorrect tube type can alter the additive or anticoagulant, leading to invalid or misleading results. Adequate sample volume, on the other hand, describes having enough specimen to perform all required tests and avoid redraws; it is not an error condition. So, having an adequate volume is not a pre-analytical error source.