Consequences of Not Following the Proper Order of Draw in Phlebotomy: Mixing Blood Samples, Contamination, Incorrect Test Results
Summary
- Mixing blood samples
- Contamination of samples
- Incorrect Test Results
Introduction
Proper phlebotomy procedures are essential in ensuring accurate and reliable Test Results in medical laboratories. One critical aspect of phlebotomy is the order of draw, which refers to the sequence in which blood samples are collected from a patient. Failure to follow the proper order of draw can have several negative consequences, including the mixing of blood samples, contamination of samples, and inaccurate Test Results. In this article, we will explore the potential consequences of not following the proper order of draw in phlebotomy procedures.
What is the Order of Draw?
The order of draw is a standardized sequence that phlebotomists follow when collecting multiple blood samples from a patient. This sequence is designed to minimize the risk of sample contamination and ensure the accuracy of Test Results. The order of draw typically follows the following sequence:
- Yellow top tubes (SPS tubes)
- Light Blue Top tubes
- Red Top tubes
- Gold or tiger top tubes
- Green top tubes
- Lavender Top tubes
- Gray top tubes
Potential Consequences of Not Following the Proper Order of Draw
Mixing Blood Samples
One of the most significant consequences of not following the proper order of draw is the mixing of blood samples. When blood samples are collected in the wrong order, there is a risk that residual blood from a previous tube may contaminate the next tube, leading to inaccurate Test Results. For example, if a phlebotomist collects a Lavender Top tube (EDTA tube) before a Red Top tube, the Anticoagulant in the lavender tube can affect the clotting process in the red tube, leading to inaccurate coagulation Test Results.
Contamination of Samples
Another consequence of not following the proper order of draw is the contamination of samples. Using the wrong tube at the wrong time can introduce substances that interfere with the accuracy of specific tests. For example, drawing a tube containing an Anticoagulant before a serum tube can lead to dilution of the sample and affect the results of tests that require serum, such as blood chemistry tests. Contaminated samples can result in false-positive or false-negative Test Results, leading to misdiagnosis and improper treatment.
Incorrect Test Results
Perhaps the most severe consequence of not following the proper order of draw is the generation of incorrect Test Results. When samples are collected out of sequence, the integrity of the specimens may be compromised, leading to unreliable Test Results. Phlebotomists rely on accurate Test Results to make informed decisions about patient care, and incorrect results can have serious implications for patient health. Inaccurate Test Results can result in misdiagnosis, inappropriate treatment, and unnecessary procedures, putting patients at risk of harm.
Conclusion
Proper phlebotomy procedures, including following the correct order of draw, are crucial in ensuring the accuracy and reliability of lab Test Results. Failure to follow the proper order of draw can have significant consequences, including mixing blood samples, sample contamination, and incorrect Test Results. Phlebotomists must be diligent in adhering to established protocols and guidelines to protect patient safety and ensure the quality of care provided. By understanding the potential consequences of not following the proper order of draw, healthcare professionals can work together to maintain the highest standards of practice in medical laboratories across the United States.
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