Question

Coomb's test is used for detection of:

• A. \( \text{Yellow fever} \)
• B. \( \text{Syphilis} \)
• C. \( \text{Typhoid} \)
• D. \( \text{Antiglobulin} \)

Hint:

The Coomb's test is essential in blood transfusion compatibility testing and diagnosing autoimmune conditions like hemolytic anemia.

Answer 1

The Correct Option is D

Step 1: Understanding the Coomb's test. The Coomb's test, also known as the antiglobulin test, is used to detect antibodies or complement proteins that are bound to the surface of red blood cells. It is primarily used in immunohematology. 

Step 2: Types of Coomb's test. - Direct Coomb's Test (DCT): Detects antibodies bound to red blood cells in conditions like hemolytic anemia or hemolytic disease of the newborn. - Indirect Coomb's Test (ICT): Detects antibodies in the serum, such as those present in transfusion reactions or during pregnancy. 

Step 3: Comparison with other options. - Option \( (A) \): Yellow fever is detected by serological tests or PCR, not Coomb's test. 
- Option \( (B) \): Syphilis is detected using tests like VDRL or TPHA. 
- Option \( (C) \): Typhoid is diagnosed using the Widal test or blood culture. 

Conclusion: The Coomb's test is specifically used for the detection of \( \text{antiglobulin} \), making \( (D) \) the correct answer.

Answer 2

The question asks what the Coombs test actually detects. Let's check each option against what this test is designed to find.

1. Yellow fever: This viral disease is diagnosed through serological antibody tests specific to the yellow fever virus or through PCR, tools that have nothing to do with the Coombs test.
2. Syphilis: This infection is diagnosed with tests like VDRL or TPHA, which detect antibodies against Treponema pallidum, again a completely separate test from Coombs.
3. Typhoid: This is diagnosed using the Widal test or a blood culture for Salmonella typhi, not the Coombs test.
4. Antiglobulin: The Coombs test is also called the antiglobulin test, because it uses anti-human globulin reagent to detect antibodies or complement proteins that have attached themselves to the surface of red blood cells. This is used to diagnose conditions like autoimmune hemolytic anemia, hemolytic disease of the newborn, and to check compatibility before blood transfusions.

The Coombs test is, by its very name, an antiglobulin test, built specifically to detect antibody or complement coating on red blood cells rather than any of the infections listed in the other options.

So the correct answer is Antiglobulin.