Which type of error occurs at the interface between a laboratorian and the patient samples?

• A. Active Error
• B. Variation
• C. Random Error
• D. Latent Error

Answer: (A)

Active errors happen at the moment a laboratorian handles or interacts with patient samples. This is the direct human action at the interface—things like mislabeling, swapping specimens, or picking the wrong tube. These mistakes occur during the actual process and have immediate consequences for the sample and results. Latent errors are deeper system flaws that set up conditions for mistakes but aren’t the mistakes themselves at the point of handling. Random error and variation describe unpredictable or natural fluctuations in measurement, not the specific hands-on interaction with samples. So, the error at the interface is an active error.