Periodic Acid Schiff

Periodic Acid Schiff (PAS)

What is a periodic acid Schiff (PAS) special stain? 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 …
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