A physician advised a viral load test for a patient with HIV. What is the purpose of this test?

Appeared in: DSSSB -28 August 2019 (Shift-2)

Explanation

A viral load test directly quantifies the amount of HIV's genetic material (RNA) in the blood, reported as copies per milliliter (copies/mL).
Its main purpose is to monitor the activity of the virus and to assess how well antiretroviral therapy (ART) is working.
A decreasing or undetectable viral load indicates that the treatment is effectively suppressing the virus.
This test is essential for managing HIV but is not the primary tool for initial diagnosis.

Option A: This is the function of an antibody test (like an ELISA or rapid test), not a viral load test. Antibody tests detect the body's immune response to the virus.
Option C: Confirming seropositivity (the presence of antibodies in the blood) is done using diagnostic antibody tests, not a viral load test. A viral load test measures viral activity, not the presence of antibodies.
Option D: This is a restatement of option A and is incorrect for the same reason. Detecting antibodies is the role of diagnostic screening tests, not monitoring tests like viral load.

Clinical Relevance

Nursing practice connection: Use the key finding related to Purpose of HIV viral load testing to guide bedside assessment, documentation, and the next nursing action.
Nurses are responsible for educating patients on the difference between diagnostic tests and monitoring tests like viral load, helping them understand the goals of their treatment.
An undetectable viral load is the primary goal of ART. This concept, known as 'Undetectable = Untransmittable' (U=U), is a crucial public health message, as it means the risk of sexual transmission of HIV is effectively zero.
What if? If a patient on ART has a viral load that increases from undetectable to 250 copies/mL, the nurse should assess for medication adherence issues, provide counseling, and notify the physician, as this may indicate virologic failure requiring a change in therapy.

How to Approach the Question

First, identify the key terms in the question: 'viral load test', 'HIV', and 'purpose'.
Recall the two main categories of HIV testing: 1) Diagnostic tests that look for evidence of infection (antibodies/antigens), and 2) Monitoring tests that measure the amount of active virus.
Analyze the options to see which category they fall into. Options A, C, and D all refer to 'antibodies' and 'seropositivity', which are related to diagnosis.
Option B refers to measuring 'plasma HIV RNA levels', which is the definition of a viral load test used for monitoring.
Therefore, the purpose of a viral load test is to measure the quantity of the virus, which directly corresponds to option B.

Concept Tested & Keywords

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E6 Medicine Harrison 22e Part 1 pp. 1632-1634, 1631-1633

Practise the full DSSSB -28 August 2019 (Shift-2)

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