The Correct Order Of Draw In Blood Collection For Accurate Test Results And Patient Safety

Summary

• Correct order of draw is essential in blood collection to prevent Cross-Contamination.
• The order of draw varies based on the types of tubes being used and the additives they contain.
• Following the correct order of draw can ensure accurate Test Results and patient safety.

Introduction

When it comes to blood collection, following the correct order of draw is crucial. This process involves drawing blood into different tubes in a specific sequence to prevent Cross-Contamination and ensure the accuracy of Test Results. The order of draw is particularly important when using tubes with additives, as mixing the blood incorrectly can lead to inaccurate results and compromise patient safety. In this article, we will discuss the correct order of draw for different types of tubes in blood collection.

The Importance of Order of Draw

The order of draw is based on the principle of preventing Cross-Contamination between different blood samples. When blood is collected into tubes with additives, such as anticoagulants or clot activators, improper mixing of samples can lead to inaccurate Test Results. For example, if a tube containing an Anticoagulant is collected after a tube with a Clot Activator, the Anticoagulant may not work effectively, leading to clotting of the sample and inaccurate Test Results.

Following the correct order of draw is essential to ensure the quality of the blood sample and the accuracy of Test Results. It is also important for patient safety, as inaccurate Test Results can lead to misdiagnosis and inappropriate treatment.

Common Types of Tubes and their Order of Draw

1. Red or Gold-Topped Tube (Serum Tube): This tube contains no additives and is used for tests that require serum, such as chemistry tests. It is usually the first tube to be drawn.
2. Light Blue-Topped Tube: This tube contains Sodium Citrate and is used for coagulation studies. It is typically the second tube to be drawn.
3. Green-Topped Tube: This tube contains Heparin and is used for tests that require plasma, such as ammonia levels. It should be drawn after the light blue-topped tube.
4. Lavender-Topped Tube: This tube contains EDTA and is used for hematology tests. It is usually the fourth tube to be drawn.
5. Gray-Topped Tube: This tube contains Sodium Fluoride and Potassium Oxalate and is used for glucose testing. It is typically the last tube to be drawn.

Exceptions to the Rule

While the above order of draw is generally accepted, there are some exceptions to the rule. In certain situations, such as when drawing blood for multiple tests from a single Venipuncture site, it may be necessary to deviate from the standard order of draw. In such cases, it is important to follow the guidelines provided by the laboratory or the manufacturer of the blood collection tubes.

It is also important to note that the order of draw may vary depending on the specific requirements of the tests being performed. In some cases, certain tubes may need to be drawn before others to ensure the accuracy of Test Results. It is important for healthcare professionals to be aware of these variations and to follow the specific instructions provided for each type of test.

Conclusion

Following the correct order of draw is essential in blood collection to prevent Cross-Contamination and ensure the accuracy of Test Results. Healthcare professionals should be familiar with the order of draw for different types of tubes and should follow the guidelines provided by the laboratory or the manufacturer of the blood collection tubes. By following the correct order of draw, healthcare professionals can help ensure the quality of blood samples and the safety of their patients.

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