RT Journal Article
SR Electronic
T1 Evaluation of GeneXpert MTB/RIF for detection of Mycobacterium tuberculosis complex and <em>rpo</em> B gene in respiratory and non-respiratory clinical specimens at a tertiary care teaching hospital in Saudi Arabia
JF Saudi Medical Journal
JO Saudi Med J
FD Prince Sultan Military Medical City
SP 1404
OP 1407
DO 10.15537/smj.2016.12.15506
VO 37
IS 12
A1 Somily, Ali M.
A1 Barry, Mazin A.
A1 Habib, Hanan A.
A1 Alotaibi, Fawzia E.
A1 Al-Zamil, Fahad A.
A1 Khan, Mohammed A.
A1 Sarwar, Mohammed S.
A1 Bakhash, Nawab D.
A1 Alrabiaah, Abdulkarim A.
A1 Shakoor, Zahid A.
A1 Senok, Abiola C.
YR 2016
UL http://smj.org.sa/content/37/12/1404.abstract
AB Objectives To assess the performance of Xpert MTB/RIF, an automated molecular test for Mycobacterium tuberculosis (MTB) and resistance to rifampin (RIF), against smear microscopy and culture method for diagnosis of MTB infection.Methods This is a retrospective analysis of 103 respiratory and 137 non-respiratory patient specimens suspected of tuberculosis at King Khalid University Hospital, Riyadh, Kingdom of Saudi Arabia performed between April 2014 and March 2015. Each sample underwent smear microscopy, mycobacterial culture, and GeneXpert MTB/RIF test.Results Fifteen out of 103 respiratory samples were smear and culture positive, whereas 9 out of 137 non-respiratory samples were smear positive. Out of 9 smear positive specimens, 8 were also culture positive. All 15 culture positive respiratory samples were detected by Xpert MTB/RIF (sensitivity and positive predictive value [PPV]=100%). Similarly, all 8 culture positive non-respiratory specimens were identified by Xpert MTB/RIF (sensitivity 100%; PPV 88.8%). The Xpert MTB/RIF detected only one false positive result in 88 smear negative respiratory specimens (specificity 98.9%; negative predictive value [NPV]= 100%). All 125 smear negative non-respiratory specimens tested negative by culture and Xpert MTB/RIF (sensitivity, specificity, PPV, NPV= 100%).Conclusion The performance of Xpert MTB/RIF was comparable to the gold standard culture method for identification of MTB in both respiratory and non-respiratory clinical specimens.