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A 4-month-old boy is brought to the emergency department due to 5 days of fever, cough, and shortness of breath. The patient was born at 38 weeks gestation via uncomplicated vaginal delivery. At age 2 months, he was diagnosed with cervical lymphadenitis that required prolonged oral antibiotics. Temperature is 38.5 C (101.3 F) , blood pressure is 80/40 mm Hg, pulse is 120/min, and respirations are 40/min. Oxygen saturation is 95% on room air. The patient is alert and responsive. Oropharyngeal examination shows no abnormalities. Mild chest retraction and bilateral rales are present. Chest x-ray reveals bilateral pulmonary infiltrates. The patient is given appropriate empiric antibiotic therapy for pneumonia; however, after 3 days, he continues to be febrile and laboratory assessment shows increased leukocyte count. CT scan of the chest shows multifocal pneumonia with areas of cavitation. Cultures obtained via bronchoalveolar lavage grow a filamentous, gram-positive rod consistent with Nocardia infection. Immunodeficiency is suspected. Which of the following tests would most likely identify the underlying immune disorder in this patient?
Predictive Validity
The extent to which a test accurately forecasts a specific future outcome.
Concurrent Validity
The degree to which the results of a particular test correlate with those of another established measure given at the same time.
Reliability
The consistency and dependability of a measure or test over time, ensuring that similar results are achieved under consistent conditions.
Standard Deviation
A statistical measure of the dispersion or variation in a set of values, indicating how much individual data points differ from the mean value.
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