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

Following the correct order of draw is crucial primarily to prevent contamination and ensure the accuracy of test results. Each type of blood collection tube contains specific additives that can interfere with tests if they come into contact with blood from improperly ordered tubes. For example, if a serum tube is drawn before a coagulation tube, the additive in the serum tube could contaminate the coagulation sample, leading to erroneous test results.

By adhering to the prescribed order, healthcare professionals can maintain the integrity of blood specimens, which is vital for accurate diagnosis and effective treatment plans. This careful process minimizes the risk of cross-contamination between samples and ensures that laboratory analyses reflect the true composition of the blood, leading to reliable outcomes for patient care.