If a patient did the mantoux test and the patient has been suffering from HIV. What value indicates the TB in… - NORCET 2 -2021 (Shift-2)

NORCET 2 -2021 (Shift-2)

Medical Surgical Nursing

Hard

Appeared in: NORCET 2 -2021 (Shift-2)

Explanation

The Mantoux test, or Tuberculin Skin Test (TST), detects an immune response to Mycobacterium tuberculosis.
Interpretation of the test result depends on the person's risk of developing active TB.
Individuals with HIV are severely immunocompromised, which can weaken their response to the TST.
Due to this blunted immune response, a smaller area of induration (firm swelling) is considered significant.
For people living with HIV, an induration of 5 mm or more is classified as a positive result, indicating TB infection.

Option B: An induration of 7 mm is indeed positive for an HIV patient, but the question asks for the cutoff value that indicates infection. The threshold for positivity in this high-risk group begins at 5 mm.
Option C: An induration of 11 mm is incorrect because it represents a higher threshold than required for an HIV-positive individual. This value is used for individuals at moderate risk.
Option D: An induration of 15 mm is the threshold for individuals with no known risk factors for TB. Applying this standard to an HIV-positive patient would lead to a missed diagnosis (false negative).

Visual 1: Diagram - A clear illustration showing how to correctly measure the transverse diameter of the induration (the firm, raised area) with a ruler, emphasizing not to measure the surrounding redness (erythema).
Visual 2: Chart - A comparative chart showing the three tiers of Mantoux test interpretation (≥5 mm, ≥10 mm, ≥15 mm) and listing the specific patient populations that fall into each category.

Clinical Relevance

Nursing practice connection: Use the key finding related to Interpretation of Mantoux test in an immunocompromised (HIV) patient to guide bedside assessment, documentation, and the next nursing action.
Tuberculosis is a leading opportunistic infection and a major cause of mortality in people living with HIV. Their compromised immune system makes them highly susceptible to progressing from latent TB infection (LTBI) to active TB disease.
Early and accurate diagnosis of LTBI in HIV-positive individuals is a critical nursing responsibility to initiate preventive therapy, which can significantly reduce the risk of developing active TB.
Nurses must be vigilant in screening HIV-positive patients for TB using the correct interpretation criteria and must educate patients on the importance of completing preventive treatment.

How to Approach the Question

First, identify the core of the question: it asks for the specific measurement that defines a positive Mantoux test.
Next, scan the stem for crucial patient information. The key detail here is that the patient has HIV.
Recognize that HIV causes immunosuppression, which is a major factor in interpreting diagnostic tests like the TST.
Recall the risk-stratified guidelines for Mantoux test interpretation. There are different cutoffs (5 mm, 10 mm, 15 mm) for different risk groups.
Connect the patient's condition (HIV) to the highest risk category, which uses the lowest threshold for a positive result.
Select the option that matches the cutoff for HIV-positive individuals, which is 5 mm.

Concept Tested & Keywords

Concept Tested: Interpretation of Mantoux test in an immunocompromised (HIV) patient
Stem keywords: Mantoux test, HIV, TB infection
Lead-in keywords: What value indicates
Clinical cues: Patient has HIV, which signifies an immunocompromised state and alters diagnostic thresholds.

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