Table 1.

The Average Within‐Tube Bias of Tumor Markers Concentrations After Storage

		Average within‐tube bias (%) for BD serum glass (95% confidence interval)				Average within‐tube bias (%) for BD SST™ II plus (95% confidence interval)
Analytes	n	t 8–t 0	t 24–t 0	t 48–t 0	t 72–t 0	t 8–t 0	t 24–t 0	t 48–t 0	t 72–t 0
AFP	30	−0.5	0.1	0.2	−0.3	−0.4	−0.2	0.2	−0.1
(ng/ml)		(−1.1, 0.1)	(−0.3, 0.6)	(−0.8, 1.1)	(−1.0, 0.4)	(−0.9, 0.1)	(−0.7, 0.3)	(−0.7, 1.2)	(−0.8, 0.7)
CEA	30	0.0	0.1	0.1	−0.1	0.2	0.1	−0.1	0.1
(ng/ml)		(−0.4, 0.4)	(−0.6, 0.8)	(0.0, 0.2)	(−1.5, 1.3)	(−0.4, 0.7)	(−0.2, 0.3)	(−0.4, 0.2)	(−1.1, 1.3)
CA19‐9	30	0.3	0.2	−0.1	−0.4	0.2	−0.3	−0.7	0.0
(U/ml)		(−0.1, 0.7)	(−1.0, 1.3)	(−0.8, 0.6)	(−1.2, 0.4)	(0.1, 0.3)	(−0.7, 0.1)	(−1.2, −0.2)	(−0.7, 0.6)
CA125	30	0.8	1.1	0.0	−0.3	−0.1	0.9	0.5	0.7
(U/ml)		(−0.2, 1.8)	(0.2, 2.0)	(−1.0, 1.0)	(−1.2, 0.7)	(−1.4, 1.2)	(−1.2, 2.9)	(−1.4, 2.3)	(−0.1, 1.4)
CA15‐3	30	1.0	0.4	−0.2	0.7	0.2	−0.3	−0.7	0.6
(U/ml)		(−0.3, 2.2)	(−0.4, 1.2)	(−1.5, 1.1)	(−0.5, 1.9)	(0.1, 0.3)	(−0.7, 0.1)	(−1.2, −0.2)	(−0.3, 1.5)
TPSA	30	1.3	0.2	0.5	−0.1	0.6	1.5	0.7	0.8
(ng/ml)		(−0.1, 2.7)	(−0.4, 0.9)	(−0.8, 1.8)	(−0.2, 0.1)	(−0.3, 1.6)	(0.4, 2.6)	(−0.3, 1.7)	(−0.5, 2.1)
FPSA	30	0.3	0.9	0.1	1.4	0.7	−0.2	0.8	1.1
(ng/ml)		(−0.2, 0.8)	(−0.4, 2.1)	(−0.5, 0.7)	(−0.2, 3.0)	(0.1, 1.3)	(−0.6, 0.2)	(−1.0, 2.6)	(−0.5, 2.7)
NSE	30	4.6	9.2	12.5	19.7	−0.9	0.2	1.6	1.2
(ng/ml)		(2.1, 7.0)	(2.8, 15.6)	(4.6, 20.5)	(8.8, 30.6)	(−2.2, 0.4)	(−0.6, 1.0)	(0.3, 2.9)	(−0.2, 2.6)
CYFRA21‐1	30	0.6	1.0	0.4	0.0	1.2	0.3	−0.2	0.6
(ng/ml)		(−0.4, 1.7)	(−0.2, 2.2)	(−0.8, 1.6)	(−1.2, 1.2)	(0.2, 2.2)	(−0.4, 1.0)	(−0.7, 0.3)	(−0.2, 1.4)
CA72‐4	30	0.1	0.7	−0.2	−0.4	1.4	0.5	0.7	0.2
(U/ml)		(−1.1, 1.3)	(−0.5, 1.9)	(−0.6, 0.2)	(−1.5, 0.7)	(0.3, 2.5)	(−1.2, 2.2)	(−1.5, 2.9)	(−0.4, 0.8)