72. When performing a blood smear, which of the following actions should a phlebotomist take to ensure a quality result?
Answer: C
Hold the slides at 30° to each other when performing the smear.
To ensure a quality blood smear, a phlebotomist should hold the slides at an angle of 30° to each other during the smear process. This angle allows for an optimal spread of the blood, resulting in a thin and even layer necessary for proper examination.
A) Hold the two slides at 90° to each other when performing the smear.
Holding the slides at 90° to one another is incorrect as this angle can lead to a thick smear that may not properly spread the blood cells. A thicker smear can obscure the visibility of individual cells and make it difficult to analyze the sample accurately.
B) Allow the blood drop to clot slightly prior to performing the smear.
Allowing the blood drop to clot slightly before performing the smear is not advisable. It is essential to make the smear immediately after the blood is collected to ensure that the cells remain intact and are evenly distributed, which is crucial for an accurate analysis.
C) Hold the slides at 30° to each other when performing the smear.
Holding the slides at 30° is the correct technique, as this angle creates a thin layer of blood that is ideal for microscopic examination. This method promotes a uniform distribution of cells, facilitating accurate results in diagnostic evaluations.
D) Allow the blood drop to clot completely prior to performing the smear.
Allowing the blood drop to clot completely is incorrect because clotting can cause the blood cells to aggregate and hinder the proper spread needed for a quality smear. The smear must be made while the blood is still liquid to preserve the cell morphology.
Conclusion
The correct technique of holding the slides at 30° ensures that the blood is spread thinly and uniformly, which is critical for accurate analysis. The other options either involve incorrect angles or timing that compromise the integrity of the sample, leading to potentially inaccurate diagnostic results. Thus, option C is definitively the best practice for performing a blood smear.