Factors related to false negative results of interferon-γ release test in patients with confirmed pulmonary tuberculosis / 中华临床感染病杂志

ABSTRACT

Objective:To analyze the influencing factors related to false-negative results of interferon-γ release assay (IGRA) QFT-GIT in patients with confirmed pulmonary tuberculosis.Methods:Clinical data of 389 patients with bacteriologically confirmed pulmonary tuberculosis who underwent QFT-GIT in Quzhou Hospital Affiliated to Wenzhou Medical University between January 1 and December 31 2020 were retrospectively analyzed. Univariate and multivariate logistic regression were used to analyze the influencing factors related to the false-negative results of QFT-GIT.Results:Among 389 confirmed patients, 347 cases had positive QFT-GIT results and 42 cases had negative results. Univariate analysis showed that the false-negative results of QFT-GIT were associated with low BMI, reduced CD4 + T lymphocyte count, decreased lymphocyte count, increased C-reactive protein, negative sputum smear, anemia, diabetes mellitus, malignant tumor and sepsis ( P<0.05 or P<0.01). Multivariate conditional logistic regression analysis showed that BMI <18.5 kg/m 2( OR=1.585, 95% CI 1.076-2.336), complicated with diabetes( OR=5.157, 95% CI 2.340-11.365), malignant tumors ( OR=5.596, 95% CI 2.048-15.295)and sepsis ( OR=4.141, 95% CI 1.042-16.459) were independent risk factors for the false-negative results of QFT-GIT ( P<0.05 or P<0.01). Conclusion:When the pulmonary tuberculosis patients are extreme emaciation, complicated with diabetes, malignant tumor or sepsis, the QFT-GIT results will be false negative.