TABLE 3.

Specificity of the HISCL anti-TP assay and Lumipulse G TP-N using samples from different patient populations

Sample and assay type	Total samples (no.)	True negative (no.)	False positive (no.)	Specificity (% [95% CI])
Syphilis negative
HISCL anti-TP	704	704	0	100 (99.32–100)
Lumipulse G TP-N	704	704	0	100 (99.32–100)
Potentially interfering
HISCL anti-TP	47a	47	0	100 (90.59–100)
Lumipulse G TP-N	47a	47	0	100 (90.59–100)
Overall
HISCL anti-TP	751	751	0	100 (99.37–100)
Lumipulse G TP-N	751	751	0	100 (99.37–100)

^aOne sample with a confirmed positive result was excluded from the analysis of specificity.