Which result from a tuberculin skin test indicates exposure to tuberculosis in a child with an immunosuppressive condition?

In the context of a tuberculin skin test, the interpretation of the induration size is essential, especially considering a child's immunosuppressive condition. A child with an immunosuppressive condition, such as those with HIV infection, organ transplant recipients, or those on immunosuppressive therapy, has a decreased ability to mount an immune response.

Standard guidelines for interpreting the tuberculin skin test indicate that a significant reaction, or induration, is defined by certain thresholds depending on the individual's risk factors and health status. For individuals who are immunocompromised, an induration of 5 mm or greater is considered positive.

Therefore, a 7-mm area of induration indicates that the child has likely been exposed to tuberculosis, as it exceeds the threshold for those with weakened immune systems. This result prompts further evaluation and consideration for treatment, as it reflects a higher risk for progression to active tuberculosis disease in this vulnerable population.

In summary, the correct interpretation hinges upon acknowledging the increased sensitivity required for individuals in immunosuppressive states; thus, a 7-mm induration is significant and indicates exposure to tuberculosis.