If a patient done the mountex test and patient has been suffering from HIV. What value indicate the TB infect… - NORCET 2 -2021 (Shift-2)

NORCET 2 -2021 (Shift-2)

Medical Surgical Nursing

Easy

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

Explanation

For individuals with HIV, a Mantoux test induration of 5 mm or more is considered a positive result for Tuberculosis (TB) infection.
This lower threshold is used because HIV compromises the immune system (cell-mediated immunity), leading to a potentially weaker skin reaction (anergy) even when a TB infection is present.
Using a 5 mm cutoff increases the test's sensitivity, ensuring that infections in this high-risk population are not missed.
This guideline is also applied to other severely immunosuppressed groups, such as organ transplant recipients and recent contacts of infectious TB cases.

Option B: While an induration of 7 mm is technically positive for an HIV patient (as it is greater than 5 mm), the question asks for the specific value that indicates positivity, which is the cutoff threshold itself. The defining threshold for this risk group is 5 mm.
Option C: An induration of 11 mm is incorrect for an HIV-positive patient. A threshold of 10 mm or more is used for individuals at moderate risk, not those who are severely immunocompromised.
Option D: An induration of 15 mm is the threshold for a positive result in individuals with no known risk factors for TB. This is the highest threshold and does not apply to an HIV-positive patient.

Visual 1: Image: A diagram showing how to measure the induration (not the erythema) of a Mantoux test reaction using a ruler.
Visual 2: Infographic: A chart comparing the three main cut-off points (5 mm, 10 mm, 15 mm) for a positive TST, with icons representing the corresponding patient populations for each.

Clinical Relevance

Nursing practice connection: Use the key finding related to Interpretation of Mantoux test (Tuberculin Skin Test) results in immunocompromised patients to guide bedside assessment, documentation, and the next nursing action.
Accurate interpretation of TST results in immunocompromised patients is critical for early diagnosis and treatment of latent TB infection (LTBI), preventing progression to active disease and subsequent transmission.
A positive TST does not distinguish between active TB disease and LTBI. A positive result in an HIV patient necessitates further evaluation, such as a chest X-ray and clinical assessment, to rule out active TB before starting preventive therapy.
What if? If the patient had no known risk factors for TB, an induration of 5 mm would be considered negative. The value indicating a positive result would change to 15 mm.

How to Approach the Question

First, identify the key clinical details provided in the question: the test being performed (Mantoux test) and the patient's specific condition (HIV positive).
Recall that the interpretation of a Mantoux test is not universal; it depends on the patient's risk factors for developing active TB.
Access your knowledge of the three different cutoff points for a positive result: 5 mm, 10 mm, and 15 mm.
Categorize the patient based on their risk. HIV infection places the patient in the highest-risk category.
Select the value that corresponds to the specific threshold for the highest-risk group, which includes HIV-positive individuals.

Concept Tested & Keywords

Concept Tested: Interpretation of Mantoux test (Tuberculin Skin Test) results in immunocompromised patients.
Stem keywords: Mantoux test, HIV, TB infection
Lead-in keywords: What value indicate
Clinical cues: Patient suffering from HIV
Negative lead-in flag: false

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