Confirmatory test for the diagnosis of Amyloidosis is :
**Core Concept**
The diagnosis of Amyloidosis involves identifying the accumulation of amyloid proteins in tissues. **Amyloidosis** is a group of diseases characterized by the deposition of amyloid fibrils, which are composed of various proteins. The confirmatory test for Amyloidosis typically involves tissue diagnosis.
**Why the Correct Answer is Right**
The correct answer is related to the histopathological examination of tissue samples. In Amyloidosis, **Congo Red staining** followed by **polarized light microscopy** is the gold standard for diagnosis, as it demonstrates the presence of amyloid deposits. This method shows apple-green birefringence under polarized light, which is pathognomonic for amyloid.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specifically relate to the confirmatory diagnosis of Amyloidosis.
**Option B:** Similarly, this option is not directly associated with the definitive diagnosis of Amyloidosis.
**Option C:** This option is also incorrect as it is not the primary method for confirming Amyloidosis.
**Why Each Wrong Option is Incorrect (Continued)**
**Option D:** While biopsy is crucial for the diagnosis, the specific technique of **Congo Red staining** under **polarized light** is key, not just any biopsy method.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **Congo Red staining** with **polarized light microscopy** is essential for diagnosing Amyloidosis, as it provides a specific diagnostic pattern. This method is critical for distinguishing Amyloidosis from other conditions.
**Correct Answer:** D. Congo Red Stain