Standard Operating Procedure (SOP) for Mounting Media
1.0 OBJECTIVE
- To impregnate the section on the slide with a transparent
medium having a refractive index close to that of glass. This ensures that all
details, including colors, are illuminated and visible.
- The final step in slide preparation involves covering the
tissue section with a thin glass cover slip, making the slide permanent and suitable
for microscopic examination. To affix the cover slip, three types of mounting
media can be used: natural resins, synthetic resins, and aqueous media.
- The laboratory uses synthetic resins, such as DPX, as the
mounting media for routine hematoxylin and eosin preparation and for most
special stains.
2.0 SCOPE
- This SOP is applicable to all types of stains used in the
Histopathology section.
3.0 RESPONSIBILITIES
- **Laboratory Technicians**: Responsible for following this
SOP and ensuring slides are properly mounted.
- **Laboratory Supervisor**: Ensures that the SOP is
followed correctly and updates it as necessary.
- **Quality Control Personnel**: Verifies that the slides
meet quality standards before use in diagnostic procedures.
4.0 MATERIALS AND EQUIPMENT
- Microscope slides
- Cover slips of appropriate size
- Mounting media (e.g., DPX)
- Glass rods
- Xylene
- Filter paper
- Clean gauze
5.0 PROCEDURE
1. **Selection of Cover Slip**:
- Choose the proper
size cover slip for the sections on the slide.
2. **Preparation of Slides**:
- Ensure the slide
is cleared of xylene by placing it onto filter paper.
3. **Application of Mounting Media**:
- Apply the
mounting media (DPX) to the section surface using a glass rod.
4. **Placement of Cover Slip**:
- Roll the cover
slip onto the slide to expel trapped air.
5. **Cleaning**:
- Clear excess
mounting medium from the edges of the cover slip.
- Avoid touching
the main area with fingers to prevent leaving the slide cloudy.
- Clean the back of
the slide with clean gauze.
6.0 QUALITY CONTROL
- Verify that there are no air bubbles or excess mounting
media on the slide.
- Ensure that the tissue section is clearly visible under
the microscope.
- Confirm that the cover slip is securely affixed and the
slide is clean.
7.0 TROUBLESHOOTING
- **Air Bubbles**: If air bubbles are trapped, gently
re-roll the cover slip to expel them.
- **Cloudy Slides**: If the slide is cloudy, ensure it is
cleaned properly and avoid touching the main area with fingers.
8.0 SAFETY CONSIDERATIONS
- Handle all chemicals, such as xylene and mounting media,
with appropriate protective equipment (gloves, goggles, lab coat).
- Work in a well-ventilated area or under a fume hood when
using volatile chemicals.
9.0 REFERENCES
- Histopathology laboratory guidelines
- Manufacturer instructions for mounting media (DPX)
10.0 DOCUMENTATION
- Record the date, type of stain used, and any observations
in the laboratory logbook.
- Maintain a record of any deviations from this SOP and
corrective actions taken.
END OF THE DOCUMENT
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