Lab Tube Draw Order

Welcome to our blog post on Lab Tube Draw Order! When it comes to drawing blood samples, it is essential to follow a specific order to ensure accurate test results and patient safety. In this article, we will discuss the importance of the draw order, the rationale behind it, and provide a step-by-step guide to help healthcare professionals understand the correct sequence.

1. Why is draw order important?

The draw order in the laboratory plays a crucial role in preventing sample contamination and ensuring accurate test results. By following a specific order, we can minimize the risk of cross-contamination between different tubes, which could potentially lead to inaccurate diagnoses and treatment plans for patients.

2. The rationale behind the order

The draw order is designed to ensure that samples are collected in a logical and efficient manner. It helps prevent any carryover of additives or substances from one tube to another, which could interfere with the accuracy of the tests being performed. Additionally, certain tests require specific additives or anticoagulants, and following the correct draw order ensures that each tube contains the necessary components for accurate analysis.

3. Step-by-step guide

Here is a step-by-step guide to the recommended draw order:

  1. Start with blood culture tubes: These tubes are sterile and used for microbiological testing.
  2. Followed by coagulation tubes: These tubes contain anticoagulants, which prevent blood from clotting.
  3. Next, collect serum tubes: These tubes do not contain any anticoagulants and are used for various chemistry tests.
  4. Continue with heparin tubes: These tubes contain anticoagulants suitable for specific tests.
  5. Collect EDTA tubes: These tubes contain the anticoagulant EDTA, commonly used for hematological tests.
  6. Finally, collect any additional specialty tubes that are required for specific tests, such as glucose tubes or blood bank tubes.

4. Ensuring patient safety

Following the proper draw order not only ensures accurate test results but also prioritizes patient safety. By minimizing the risk of contamination and maintaining the integrity of each sample, healthcare professionals can provide patients with reliable diagnoses and appropriate treatment plans.

5. Adhering to industry standards

It is important for healthcare professionals to adhere to industry standards and guidelines when it comes to lab tube draw order. These standards are put in place to promote uniformity and consistency in sample collection practices across different healthcare settings.


Understanding the importance of lab tube draw order is essential for healthcare professionals involved in phlebotomy and sample collection. By following the correct sequence, we can ensure accurate test results, minimize contamination risks, and prioritize patient safety. If you have any questions or additional insights on this topic, please feel free to leave a comment below.

Leave a Comment



Order of Draw for Multiple Tube Collections. When collecting multiple specimens, blood tubes should be drawn in the following order; mix all tubes by … –

Order of Draw – Tube Guide – (7.14.17)

Order Test. Code Name. 3810 Antibody Screen. 3800 Blood Group. (ABO) and RH. Type. 1000 CBC w/ Auto Diff w/ Platelets. 1041 CBC w/out Diff w/ Platelets. 2708 … –

Blood Tube Draw Order

When getting blood work done have you ever wondered why the phlebotomist uses different colored tubes to collect your blood samples? This is because specific tests require different additives or anticoagulants to ensure accurate results. In this blog post we will explore the order in which blood tub –

Blood Tube Draw Order

Order of draw of blood samples affect potassium results without K …

Apr 15, 2021 … Anticoagulant K-EDTA is frequently used as a sample tube anticoagulant for laboratory assays including complete blood count, glycated … –

Order of draw of blood samples affect potassium results without K ...


Leave a Reply

Your email address will not be published. Required fields are marked *