Phlebotomy – Order of Draw Practice Test

The proper mixing of blood specimens in a lavender tube is crucial for ensuring accurate laboratory results, specifically for tests like the Complete Blood Count (CBC). The lavender tube contains an anticoagulant, typically EDTA, which is designed to prevent blood from clotting. If the blood is not mixed adequately with the anticoagulant, clots can form within the sample.

Clot formation can significantly affect the accuracy of test results for a CBC because it can lead to the loss of cellular components that are supposed to be evaluated in the test. This can result in erroneous readings of important blood parameters such as hemoglobin, hematocrit, and white blood cell counts. Therefore, improper mixing directly compromises the integrity of the sample, leading to potentially misleading results. By guaranteeing thorough mixing, the sample remains homogenous and accurately reflects the individual's blood composition, allowing for reliable diagnostic conclusions.