TABLE 3.

Effect of introducing two different concentrations of C. trachomatis EBs to urine before and after processing on the number of samples whose results fall below the test cutoff (false negative) by the LCx assay

No. of C. trachomatis EBs added	No. of negative urine specimens/total no. of C. trachomatis EB-spiked urine specimens (%)
	Before processing		After processing
	Original test	Repeat test with 1:2 dilution	Original test	Repeat test with 1:2 dilution
100	2/70 (2.9)	1/2 (50)	2/70 (2.9)	0/2 (0)
12	34/70 (48.6)	34/34 (100)	21/70 (30)	9/21 (42.8)