The ELISA test is used to?

NHM UP Staff Nurse - 2016

Microbiology

Easy

Appeared in: NHM UP Staff Nurse - 2016

Explanation

The ELISA (Enzyme-Linked Immunosorbent Assay) is a highly sensitive screening test used to detect HIV antibodies and/or the p24 antigen.
It is a standard procedure for screening blood donors and blood units intended for transfusion to ensure the safety of the blood supply.
In a clinical setting, it serves as the initial test to aid in the diagnosis of HIV infection in individuals.
A positive ELISA result is always followed by a more specific confirmatory test (like a Western blot or nucleic acid test) to rule out false positives.
Since the test is used for screening the blood supply (donors and transfusions) and for diagnostic aid, 'All of the above' is the most comprehensive and correct answer.

Option A: This statement is correct, but it describes only one of the several important uses of the ELISA test for HIV. It is an incomplete answer.
Option B: Similar to the first option, this is a valid use of ELISA but does not cover its full scope. It is an incomplete answer.
Option C: While ELISA is a crucial first step in diagnosing AIDS, its role is not limited to diagnosis. It is also a primary tool for public health screening of the blood supply. This makes the option incomplete.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Applications of the ELISA test for HIV as background academic context rather than a clinical decision trigger.
Nurses are central to providing pre-test and post-test counseling for HIV. It is critical to explain that a positive screening result from an ELISA test is not a final diagnosis and requires confirmation, which helps manage patient anxiety.
Patient education on the 'window period' is a key nursing responsibility. A person can be infected with HIV but test negative if the test is done too soon after exposure before the body has produced detectable antibodies.
Nurses must ensure that all blood transfusions are administered only after confirming they have been screened for infectious agents like HIV, adhering to strict safety protocols.

How to Approach the Question

First, identify the core of the question, which asks for the function or use of the 'ELISA test' in the context of HIV.
Read all the options carefully (A, B, C, and D).
Evaluate each of the first three options (A, B, C) for its accuracy. Recall that ELISA is a standard screening test.
Determine if screening blood donors is a valid use. (Yes, it is).
Determine if testing blood for transfusion is a valid use. (Yes, it is).
Determine if aiding in diagnosis is a valid use. (Yes, it is the initial step).

Concept Tested & Keywords

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