Pathologists and clinical laboratories often rely on polarized light microscopy to identify specific structures that are otherwise difficult to visualize under standard brightfield illumination. One of the most important examples is the detection of Congo red staining and crystals in clinical samples such as gout-related uric acid crystals in urine or synovial fluid.
Olympus designed a specialized analyzer, the U-GAN Gout Analyzer, specifically for this type of diagnostic work on Olympus BX series microscopes.
At Munday Scientific and Microscope Marketplace, we frequently help pathology labs configure microscopes for Congo red evaluation and polarized crystal identification, and the U-GAN analyzer is a key component in that setup.
Video Demonstration and Installation
In this video, Chad Potts walks through how the analyzer works, how it installs on an Olympus BX microscope, and how it is used alongside the correct polarizer to create a functional polarized light setup for diagnostic work.
https://www.youtube.com/watch?v=usPbeNxmhC0
What is Congo Red and Why Is Polarized Light Important?
Congo red is a histological stain commonly used in pathology to identify amyloid deposits in tissue samples. When viewed under polarized light, Congo red–stained amyloid exhibits a characteristic apple-green birefringence, which is considered a hallmark diagnostic feature.
Polarized microscopy is also widely used for identifying crystalline structures, including those seen in gout.
In urine or synovial fluid samples, uric acid crystals display strong birefringence when viewed under polarized light. This optical property allows pathologists to distinguish crystal types and confirm diagnoses.
Without polarization, many of these structures appear subtle or nearly invisible.
The Olympus U-GAN Analyzer
The Olympus U-GAN analyzer is designed specifically for use with gout and crystal analysis applications.
It fits into the analyzer slot of many Olympus BX microscopes and works together with a polarizer to produce crossed polarized light. This optical configuration reveals birefringent structures such as uric acid crystals and Congo red stained amyloid deposits.
You can view the analyzer here:
U-GAN Gout Analyzer
https://microscopemarketplace.com/products/olympus-microscope-u-gan-gout-analyzer?_pos=1&_sid=b04880eba&_ss=r
When paired with the correct polarizer, the system allows laboratories to perform reliable polarized light examinations for diagnostic purposes.
Required Polarizers for Olympus BX Microscopes
To create a complete polarized light setup, the analyzer must be paired with a compatible polarizer installed in the microscope’s illumination path.
For many Olympus BX microscopes, the most common option is the U-POT polarizer.
U-POT Polarizer
https://microscopemarketplace.com/products/olympus-microscope-u-pot-polarizer?_pos=1&_psq=u-pot&_ss=e&_v=1.0
This polarizer works with the analyzer to create crossed polarization, allowing birefringent materials to stand out clearly.
Polarizer Option for BX45 and BX46
If you are using an Olympus BX45 or BX46 microscope, you may need the U-P500 polarizer, which is designed specifically for those models.
U-P500 Polarizer for BX45 / BX46
https://microscopemarketplace.com/products/olympus-microscope-bx45-po-polarizer?_pos=1&_sid=85c0b60fb&_ss=r
This polarizer integrates cleanly with the BX45 and BX46 illumination system and pairs with the analyzer for polarization imaging.
How to add the polarizer to a BX45 or BX46
https://youtu.be/HrSQRJDjRgA
Simple Polarization Option: U-ANT Analyzer
If you are looking for a basic polarization setup rather than the specialized gout analyzer, Olympus also offers the U-ANT analyzer.
This component allows standard polarized light microscopy when paired with the correct polarizer.
U-ANT Analyzer
https://microscopemarketplace.com/products/olympus-microscope-u-ant-analyzer?_pos=1&_psq=u-ant&_ss=e&_v=1.0
Many labs use this analyzer for general birefringence applications, including crystal identification and other polarized microscopy techniques.
Applications in Pathology and Clinical Labs
Pathologists commonly use polarized microscopy for several important diagnostic tasks.
These include:
• Detecting amyloid deposits using Congo red staining
• Identifying uric acid crystals associated with gout
• Evaluating birefringent crystalline structures in bodily fluids
• Analyzing polarized structures in histological samples
With the correct analyzer and polarizer combination installed on an Olympus BX microscope, these observations become much easier and more reliable.
Building the Right Polarized Light Setup
A typical polarization configuration on an Olympus BX microscope will include:
• A polarizer installed in the illumination path
• An analyzer installed above the objective path
• A compatible objective and condenser configuration
When properly aligned, these components produce crossed polarized light, which reveals birefringent structures with high contrast.
For pathologists working with Congo red or gout samples, this setup becomes an essential diagnostic tool.
Final Thoughts
Polarized light microscopy remains one of the most powerful techniques in pathology for identifying birefringent materials such as amyloid deposits and uric acid crystals.
With the Olympus U-GAN analyzer paired with the correct polarizer, laboratories can easily configure an Olympus BX microscope for this type of diagnostic work.
If you are setting up or upgrading a microscope for Congo red analysis or gout crystal detection, the components above provide a reliable and proven solution.
Munday Scientific and Microscope Marketplace regularly helps pathology labs configure these systems and can assist with selecting the correct parts for your microscope model.