TABLE 3.

Results for real-time PCR sensitivity proficiency program

Sample code	Strain	DNA (fg/μl)	Result for IS481 detectiona									Mean CT	Interval CT
			Lab. 1 (NRC)	Lab. 2	Lab. 3	Lab. 4	Lab. 5	Lab. 6	Lab. 7	Lab. 8	Lab. 9
QC8-1	CIP8132	1,000	+	+	+	+	+	+	+	+	+	24	17-29
QC8-2	CIP8132	100	+	+	+	+	+	+	+	+	+	28	21-33
QC8-3	CIP8132	10	+	+	+	+	+	+	+	+	+	32	24-37
QC8-4	CIP8132	1	+	+	+	+	+	+	+	+	+	35	27-42
QC8-5	CIP8132	0.1	+	−	−	+	−	−	+	+	+	38	31-44
QC8-6	CIP8132	0.01	−	−	−	−	−	−	−	+	−

^aLab., laboratory.