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 the order of draw for blood collection, the red-speckled stopper tube is prioritized first to avoid contamination of samples that require additive-free blood. This protocol helps ensure the accuracy of test results by preventing cross-contamination from other tubes.

A (Gray stopper) YOUR ANSWER

Gray stopper tubes are typically used for glucose testing and contain additives such as sodium fluoride. They should be drawn later in the sequence to prevent any potential interference with tests requiring serum, as their chemicals can affect the accuracy of other tests.

B (Green-speckled stopper) YOUR ANSWER

Green-speckled stopper tubes contain lithium heparin and are used for various tests, including plasma determinations. These tubes are drawn after the red-speckled stopper to maintain the integrity of serum samples and avoid contamination from anticoagulants present in heparin tubes.

C (Lavender stopper) YOUR ANSWER

Lavender stopper tubes, which contain EDTA as an anticoagulant, are used for hematology tests like complete blood counts. They should be drawn after the red-speckled stopper to prevent the anticoagulant from affecting serum tests or other assays that require unclotted blood.

D (Red-speckled stopper) CORRECT

The red-speckled stopper tube is the correct first choice in the order of draw, as it is designed for serum collection without additives. Drawing this tube first minimizes the risk of contamination from other additives found in subsequent tubes, ensuring accurate test results.

Conclusion

In blood collection, following the correct order of draw is essential for obtaining reliable test results. The red-speckled stopper tube is drawn first to collect serum without additives, while subsequent tubes with anticoagulants or preservatives must follow to avoid contamination. Adhering to this order facilitates accurate diagnostics and effective patient care.

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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