TABLE 1.

Comparison of the Bio-Rad BioPlex Syphilis IgG assay and the Trep-Chek IgG EIA using 1,008 prospective serum samples

Bio-Rad BioPlex Syphilis IgG assay result	No. of Trep-Chek IgG EIA results
	Positive	Negative	Total
Positive	77	14a	91
Negative	1b	916	917
Total	78	930	1,008

^aEight out of these 14 samples were positive by TP-PA.

^bThis sample became negative by EIA upon repeat testing.