Table 4.

Comparison of results (ng/mL) from LC-ESI-/MS/MS and RIA methods on bovine serum

	Rep	3,5-T2	3,3'-T2	T3	rT3	T4
Bovine serum
LC/MS/MS	1	<0.74	<0.92	3.86	<1.4	77.4
	2	<0.74	<0.92	4.01	<1.4	86.4
	3	<0.74	<0.92	3.36	<1.4	87.1
mean ±sd		<0.74	<0.92	3.74±0.34	<1.4	83.6±5.41
RIA	1	naa	na	3.40	na	100
	2	na	na	3.37	na	103
	3	na	na	3.03	na	109
mean ±sd		na	na	3.24±0.21	na	104±4.58
SRM 1951b
This study	1	<0.74	<0.92	1.17	<1.4	78.3
	2	<0.74	<0.92	1.33	<1.4	76.6
	3	<0.74	<0.92	1.14	<1.4	78.6
mean ±sd		<0.74	<0.92	1.21±0.102	<1.4	77.5±1.08
The study by Tai et al. [29]	1	na	na	0.940	na	na
	2	na	na	0.900	na	na
	3	na	na	0.897	na	na
mean ±sd		na	na	0.912±0.0024	na	na

^ana not available