Orthotoludine test can detect?
**Core Concept**
The orthotoluidine test is a chemical assay used to detect the presence of bilirubin in serum or urine. It is based on the principle of peroxidase activity, where orthotoluidine reacts with hydrogen peroxide in the presence of bilirubin to form a blue-colored compound.
**Why the Correct Answer is Right**
The orthotoluidine test is a specific and sensitive method for detecting bilirubin, which is a breakdown product of hemoglobin. In this test, bilirubin acts as a peroxidase, catalyzing the reaction between orthotoluidine and hydrogen peroxide. The resulting blue color is directly proportional to the concentration of bilirubin present in the sample. This reaction is specific to bilirubin and is not affected by other substances present in the sample.
**Why Each Wrong Option is Incorrect**
* **Option A:** The orthotoluidine test is not used to detect glucose levels. This is a characteristic of the Benedict's test or the glucose oxidase method.
* **Option B:** The orthotoluidine test is not used to detect protein levels. This is typically done using the Biuret test or the Lowry method.
* **Option C:** The orthotoluidine test is not used to detect cholesterol levels. This is usually done using the cholesterol oxidase method or the Liebermann-Burchard test.
**Clinical Pearl / High-Yield Fact**
The orthotoluidine test is a rapid and simple method for detecting bilirubin, making it a useful tool in clinical settings for diagnosing conditions such as jaundice or liver dysfunction.
**Correct Answer: C. Bilirubin**