ASCP Phlebotomy Technician Certification Practice Exam 2025 - Free Phlebotomy Practice Questions and Study Guide

In a properly made blood smear, the presence of a feathered edge is essential for accurate cell evaluation. The feathered edge is formed when the blood is spread thinly across the slide, allowing a gradual transition from a thick center to a very thin edge. This characteristic is crucial because it enables the observer to analyze individual blood cells more effectively.

Cells at the feathered edge are typically well-distributed, which aids in identifying cell morphology and making accurate assessments of various cell types, including red blood cells, white blood cells, and platelets. This thin edge helps to prevent overlapping of cells that could obscure analysis and contribute to misinterpretations.

While a smooth edge may indicate a competent smear technique, it does not specifically serve the purpose necessary for cell evaluation. A thick center often contains clumped cells and is not ideal for diagnostic purposes, as it can prevent a clear view of individual cell morphology. An irregular edge can lead to inconsistent cell distribution and hinder the ability to analyze the sample accurately. Thus, achieving a feathered edge is critical to preparing a blood smear for effective clinical interpretation.