Difficulty: Easy

Average Score: 85%

When preparing for a blood smear, which of the following should a phlebotomist use to ensure the best test result?

Rationale

Venous blood from an EDTA tube

When preparing for a blood smear, a phlebotomist should use venous blood from an EDTA tube to ensure the best test result. EDTA (ethylenediaminetetraacetic acid) is commonly used as an anticoagulant in blood collection tubes, preventing clotting and preserving cell morphology for accurate microscopy examination.

B (Venous blood from a sodium citrate tube) YOUR ANSWER

Sodium citrate tubes are typically used for coagulation studies, as sodium citrate acts as an anticoagulant by binding calcium ions and inhibiting the clotting cascade. However, for a blood smear preparation, EDTA tubes are preferred to maintain cell integrity without interference from coagulation factors.

C (Venous blood from a fluoride tube) YOUR ANSWER

Fluoride tubes contain sodium fluoride or potassium oxalate to prevent glycolysis in blood samples for glucose testing. While these additives preserve glucose levels, they are not suitable for blood smear preparations, where EDTA is more appropriate for maintaining cell structure.

D (Venous blood from a heparin tube) YOUR ANSWER

Heparin is an anticoagulant that inhibits thrombin formation and is commonly used in heparin tubes for various laboratory tests. However, heparin may interfere with blood smear preparations by altering cell morphology and staining characteristics, making EDTA tubes the preferred choice for this specific procedure.

Conclusion

For optimal blood smear preparation, using venous blood collected in an EDTA tube is crucial. EDTA helps maintain cell integrity without affecting the morphological features critical for accurate microscopic examination. Choosing the correct anticoagulant ensures that the blood smear will provide reliable and high-quality test results.

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