Evaluation of the BD GeneOhm MRSA and VanR Assays as a Rapid Screening Tool for Detection of Methicillin-Resistant Staphylococcus aureus and Vancomycin-Resistant Enterococci in a Tertiary Hospital in Saudi Arabia

Table 3

Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of the BD GeneOhm Assay MRSA real-time PCR using nasal and groin swabs.

Value % (95% CI)	Type of sample
	Nasal swabs (728)	Groin swabs (1539)
Sensitivity^1	97.2% (0.83–0.99)	100% (0.86–1)
Specificity^2	99.4% (0.98–0.99)	98.7% (0.97–0.99)
PPV^3	89.7% (0.74–0.96)	61.5% (0.47–0.74)
NPV^4	99.9% (0.99–0.99)	100% (0.99–1)

¹The proportion of actual positives by PCR which are correctly identified as such.
²The proportion of actual negatives by PCR which are correctly identified as such.
³The proportion of positive test results with PCR who are correctly diagnosed.
⁴The proportion of negative test results with PCR who are correctly diagnosed.