Analysis on the sensitivity and specificity of T-SPOT .TB and PPD test in the diagnosis of bone and joint tuberculosis / 国际检验医学杂志

ABSTRACT

Objective To analyze the application value of T-SPOT .TB and PPD test in the diagnosis of bone and joint tuberculo-sis .Methods A total of 94 patients with tuberculosis of the bone and joint receiving surgery or conservative treatment from January 2014 to August 2016 were collected in this study ,50 patients with osteoarthritistreated by surgical treatment of bone surgery were recruited as objects too .All the objects received T-SPOT .TB and PPD test ,and the diagnosis value were compared .Results The diagnostic sensitivity ,specificity ,positive predictive value ,negative predictive value and accuracy of PPD test were 46 .81% , 98 .00% ,97 .78% ,49 .49% ,64 .58% ,those of T-SPOT .TB were 93 .62% ,100% ,100% ,89 .29% ,95 .83% .The sensitivity ,nega-tive predictive value and the coincidence rate of PPD test were less than those of T-SPOT .TB and joint test ,the differences were statistically significant(P<0 .05) ,T-SPOT .TB ,combined with the diagnostic sensitivity ,specificity ,positive predictive value ,nega-tive predictive value ,with rate no significant difference(P>0 .05) .Six cases were misdiagnosed by T-SPOT .TB ,they were all in the early stage of spinal tuberculosis ,showed cavities ,but no spinal nerve defect .One cases were erroneous diagnosis ,while 50 cases were misdiagnosed by PPD test ,all the symptoms of misdiagnosed patients were relatively mild ,with rheumatoid arthritis and other autoimmune diseases .Conclusion T-SPOT .TB is an ideal method for diagnosis of bone and joint tuberculosis ,but present interfer-ence factors ,the operation of PPD testis simply ,but lack of sensitivity ,however it has certain value in screening .