Periodic Acid Schiff (PAS)

Periodic acid Schiff (also known as PAS) is a special stain test performed by pathologists to look for two types of chemicals in a tissue sample: a type of sugar called glycogen, and a type of protein called mucin. Pathologists often perform a PAS stain when they are trying to determine if the cells in …
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Special stain

A special stain is a type of test that helps pathologists see details in a tissue sample that cannot be seen with the more common hematoxylin and eosin (H&E) stain. Pathologists perform this type of test by adding a coloured dye (the stain) to a tissue sample which is then examined under a microscope. The …
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