Why is it important to follow the correct order of draw?

Following the correct order of draw is crucial primarily to avoid errors in blood sample processing. Different additives in the blood collection tubes can interfere with one another. When blood is drawn, it is essential to prevent contamination between samples and to ensure that the additives are not altered by the blood from other tubes. For instance, an additive in a serum tube may interfere with the test results of a plasma tube if drawn out of order, leading to inaccurate laboratory results. By adhering to the specified order, phlebotomists can help ensure the integrity of the samples and provide accurate diagnoses or assessments based on those results.

While saving time, ensuring the accuracy of laboratory equipment, and complying with regulatory standards are important aspects of laboratory practice, they do not directly address the critical issue of sample integrity, which is paramount in the order of draw.