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Effect of formalin tissue fixation and processing on immunohistochemistry
1Institut für Allgemeine Pathologie und Pathologische Anatomie, Klinikum rechts der Isar, Technische Universität München, Germany. martin.werner@lrz.tum.de
The American Journal of Surgical Pathology
|July 15, 2000
Summary
Standardizing immunohistochemistry requires optimizing tissue fixation and processing. Prompt fixation and controlled duration, alongside fresh processing solutions, can improve staining reproducibility in pathology labs.
Area of Science:
- Pathology
- Laboratory Medicine
- Histology
Background:
- Immunohistochemistry (IHC) staining reproducibility is often compromised by variations in tissue handling.
- Tissue fixation and processing are identified as primary sources of variability in IHC assays.
Purpose of the Study:
- To address the lack of standardization in immunohistochemistry (IHC) staining.
- To identify and propose solutions for variability introduced by tissue fixation and processing.
Main Methods:
- The report summarizes findings from the International Consensus Group on Standardization and Quality Control (ICGSQC) meeting.
- Key issues discussed include formalin fixation challenges and tissue dehydration during processing.
Main Results:
- Formalin fixation variability arises from delayed fixation and inconsistent duration (over- or under-fixation).
- Inadequate tissue dehydration before paraffin embedding is a significant issue in tissue processing.
- Implementing timely fixation (within 30 minutes) and controlled fixation duration (24-48 hours) are recommended.
- Fresh preparation of processing solutions weekly is crucial for preventing dehydration issues.
Conclusions:
- Standardizing tissue fixation and processing is essential for improving immunohistochemistry reproducibility.
- Adherence to recommended fixation and processing protocols can mitigate major sources of IHC staining variation.