Question 63

Hold the slides at 30° to each other when performing the smear

To ensure a quality result when performing a blood smear, a phlebotomist should hold the slides at an angle of 30° to each other. This angle allows for an optimal spreading of the blood, creating a thin, even layer necessary for accurate microscopic evaluation.

A) Hold the two slides at 90° to each other when performing the smear

Holding the slides at 90° would create a thick smear that is difficult to interpret. The angle is too steep for effective spreading of the blood, leading to uneven distribution and potentially erroneous results.

B) Allow the blood drop to clot slightly prior to performing the smear

Allowing the blood drop to clot slightly is not advisable, as it can hinder the spreading process. A smear needs to be made while the blood is still in a liquid state to ensure an even and thin layer for accurate examination.

C) Hold the slides at 30° to each other when performing the smear

Holding the slides at 30° is the correct practice as it facilitates a proper, thin smear. This angle promotes an optimal blood spread, making it easier to identify different cell types under the microscope.

D) Allow the blood drop to clot completely prior to performing the smear

Allowing the blood drop to clot completely is inappropriate for smear preparation. Once blood has clotted, it cannot be spread effectively, resulting in a poor quality smear that cannot be accurately assessed.

Conclusion

The best practice for preparing a blood smear is to hold the slides at a 30° angle, which ensures an even and thin distribution of blood. Other options, such as using a 90° angle or allowing the blood to clot, can lead to ineffective smears that compromise the accuracy of diagnostic evaluations. Therefore, option C is the definitive choice for achieving quality results in blood smear preparation.