Which type of microscope is typically used when cleaning a CVS (chorionic villus) sample?

The dissection microscope is commonly used for cleaning chorionic villus sampling (CVS) samples due to its design and functionality. This microscope provides a three-dimensional view and a broader field of view, which is essential for examining and manipulating delicate tissues such as chorionic villi. It allows the technologist to easily observe the sample without the need for a high magnification that might damage the tissue.

Furthermore, dissection microscopes typically come equipped with adequate illumination and adjustable working distances, making them ideal for tasks that require both precision and clarity when working with small, often fragile biological samples. This capability is vital in cytogenetic analysis, where maintaining sample integrity is crucial for accurate results.

Other types of microscopes, like electron microscopes, are designed for much higher magnification and resolution, primarily for ultrastructural studies, which would not be practical in this cleaning context. Fluorescence microscopes are specialized for viewing fluorescently labeled specimens, while phase contrast microscopes enhance differences in transparency between structures, both of which do not lend themselves well to the cleaning process of CVS samples.