FeCI3 test is used in diagnosis of –
**Core Concept**
The FeCl3 test is a diagnostic tool used to detect the presence of reducing substances, specifically in the context of carbohydrate metabolism. It relies on the principle of oxidation-reduction reactions, where the presence of a reducing sugar reacts with ferric chloride (FeCl3) to produce a colored compound.
**Why the Correct Answer is Right**
The FeCl3 test is commonly used to diagnose conditions associated with carbohydrate metabolism disorders, such as diabetes mellitus. When a reducing sugar is present, it reacts with FeCl3 to form a green-colored complex. This reaction is due to the oxidation of the sugar molecule, which is indicative of its reducing properties. The FeCl3 test is a simple, non-invasive method for detecting the presence of glucose in urine, making it a useful tool in the diagnosis of diabetes.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the FeCl3 test is not used for diagnosing conditions related to protein metabolism.
* **Option B:** This option is incorrect because the Benedict's test is a different diagnostic tool used for detecting reducing sugars, but it is not the FeCl3 test.
* **Option C:** This option is incorrect because the FeCl3 test is not used for diagnosing conditions related to fat metabolism.
**Clinical Pearl / High-Yield Fact**
The FeCl3 test is a rapid and inexpensive method for detecting reducing sugars in urine, but it is not as sensitive as more advanced diagnostic tools like the glucose oxidase test.
**Correct Answer: C. Diabetes mellitus**