PAS Stain Explained: Principle, Procedure, Diastase, Interpretation

PAS Stain Explained: Principle, Procedure, Diastase, Interpretation In this complete PAS stain tutorial, we explain the Periodic Acid–Schiff (PAS) stain, a core histochemical staining technique used to detect glycogen, mucopolysaccharides, basement membranes, mucins, and fungi in tissue sections. PAS is essential in renal pathology, liver pathology, tumor characterization, and fungal detection. 📌 This video covers: • The principle of the PAS reaction — oxidation of vicinal diols and Schiff reagent chemistry • How periodic acid generates aldehydes and why Schiff reagent gives magenta color • Full step by step procedure with deparaffinization, oxidation, Schiff application, counterstaining, dehydration, and mounting • Differences between PAS and PAS D (diastase) for glycogen digestion and interpretation • Key microscopic appearances — basement membranes, mucins, glycogen, fungal cell walls • Common staining errors, troubleshooting tips, and reagent handling guidance • ISO 15189:2022 quality control and documentation requirements for accredited pathology labs • Clinical relevance in diagnoses like glycogen storage diseases, diabetic nephropathy, adenocarcinomas, and fungal infections This lecture is ideal for: ✔ Histology and pathology students ✔ Medical Laboratory Scientists and Histotechnologists ✔ Cytopathology and anatomical pathology professionals ✔ Quality assurance teams in clinical labs ✔ ISO 15189 audit preparation By the end of this video, you’ll understand both how PAS staining works chemically and how to apply it consistently in diagnostic practice with quality control measures that ensure accurate interpretations. #PASStain, #PeriodicAcidSchiff, #Histology, #MedicalLaboratoryScience, #GlycogenStain, #BasementMembrane, #FungalDetection, #PASvsPASD, #DiastasePAS, #Cytochemistry, #Histopathology, #SpecialStains, #ISO15189, #QualityControl, #DiagnosticPathology, #RenalPathology, #LiverPathology, #MucinStain, #TumorStain