In which of the following disorders, there is an increase concentration of urea in blood ?

Options

A. Uremia
B. Haematuria
C. Pyuria
D. Polyures

Answer

To solve the question regarding which disorder is characterized by an increased concentration of urea in the blood, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Urea and Its Role**:
- Urea is a nitrogenous waste product formed in the liver from the breakdown of proteins. It is normally excreted from the body through urine by the kidneys.

2. **Identifying the Disorders**:
- We need to analyze the options provided to see which one is associated with increased urea levels in the blood.

3. **Evaluating Each Option**:
- **Option 1: Uremia**: This condition is specifically defined as an increased concentration of urea in the blood, often due to kidney dysfunction. Therefore, this is a strong candidate for our answer.
- **Option 2: Hematuria**: This term refers to the presence of blood in urine, which does not relate to urea concentration in the blood.
- **Option 3: Pyuria**: This condition involves the presence of pus or white blood cells in urine, indicating infection or inflammation, and is not related to urea levels.
- **Option 4: Polyuria**: This refers to the production of abnormally large volumes of urine, which is not a disorder that indicates increased urea concentration in the blood.

4. **Conclusion**:
- After evaluating all the options, we conclude that **Option 1: Uremia** is the correct answer, as it directly relates to increased urea concentration in the blood.

### Final Answer:
- The disorder characterized by an increased concentration of urea in the blood is **Uremia**.