Which of the following criteria is acceptable in determining the quality of a peripheral blood smear?

A blood smear that only covers a quarter of the slide is inadequate for a comprehensive analysis. This limited coverage does not provide enough cells for evaluation and may lead to misinterpretation or missed abnormalities, as the sample size is too small to be representative.

While a well-defined edge might seem beneficial, it is not a primary criterion for assessing smear quality. A defined edge does not ensure the presence of a feathered edge, which is essential for observing a gradient of cells. Instead, a well-defined edge can occur in smears that are not optimally prepared for analysis.

Although covering the entire slide might seem ideal, it actually indicates that the smear is too thick or improperly prepared. This can lead to overlapping cells and hinder accurate examination, making it challenging to evaluate the morphology of individual cells, which is crucial for diagnostic purposes.