Which of the following tubes comes first in the order of draw?

Rationale

Red-speckled stopper tube comes first in the order of draw.

In phlebotomy, the order of draw is crucial to prevent cross-contamination of additives that can interfere with test results. The red-speckled stopper tube is typically the first in the sequence, allowing for the collection of serum without additives.

A (Gray stopper) YOUR ANSWER

The gray stopper tube contains additives such as potassium oxalate and sodium fluoride, which are used for glucose testing and other specific assays. Because of these additives, it is placed later in the order of draw to avoid contamination with serum samples collected earlier.

B (Green-speckled stopper) YOUR ANSWER

The green-speckled stopper tube contains heparin, an anticoagulant used for plasma tests. It is drawn after the red-speckled stopper tube to prevent the heparin from affecting the serum samples collected first, ensuring accurate test results.

C (Lavender stopper) YOUR ANSWER

The lavender stopper tube contains EDTA, another anticoagulant that is used primarily for hematology tests. Similar to the green-speckled stopper, it is drawn later in the order to prevent any interaction between the EDTA and samples collected in tubes without additives.

D (Red-speckled stopper) CORRECT

The red-speckled stopper tube is used for collecting serum without any additives, making it ideal for a variety of tests that require serum. Being the first in the order of draw ensures that no contaminants from other additives interfere with the results.

Conclusion

The proper order of draw is essential in phlebotomy to maintain the integrity of each specimen collected. The red-speckled stopper tube is prioritized first to ensure that serum samples are collected without any additive interference, followed by tubes with various anticoagulants. This systematic approach is crucial for obtaining accurate laboratory results.

Which of the following tubes comes first in the order of draw?

Red-speckled stopper tube comes first in the order of draw.

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