Question 68

A feathered edge

A feathered edge is an acceptable criterion in determining the quality of a peripheral blood smear as it indicates a proper technique that allows for the optimal distribution of cells for examination.

A) Covers a quarter of the slide

This option is incorrect as a blood smear that only covers a quarter of the slide does not provide sufficient area for analysis. A proper smear should allow for the examination of a larger sample to assess cell morphology effectively.

B) A well-defined edge

While a well-defined edge can be important, it is not the primary criterion for quality in a peripheral blood smear. The edge must be appropriately feathered to ensure that cells are well-distributed and identifiable, which is not necessarily indicated by just having a well-defined edge.

C) Covers the entire slide

Covering the entire slide is not a requirement for a quality blood smear. In fact, a smear that is too thick or covers the entire slide can lead to overlapping cells, making it difficult to assess individual cell morphology accurately.

D) A feathered edge

This option is correct as a feathered edge allows for the optimal spread of blood cells across the slide. It facilitates the examination of individual cells in a monolayer, which is essential for accurate evaluation and diagnosis.

Conclusion

The correct answer, a feathered edge, is crucial for the quality of a peripheral blood smear because it ensures that cells are evenly distributed for analysis. Other options fail to meet the necessary criteria for a high-quality smear, either by not providing enough area for examination or by not allowing for the proper visualization of cells.