Table 2.

Inaccuracy of the proposed method for lyophilized and liquid serum specimensa (mmol/L, n = 10)

Cations	Specimen	IC	CV (%)	Reference value	Bias (%)
Na	Serum‐I	132.79	0.36	133.0b	−0.16
	Serum‐II	148.54	0.20	149.0b	−0.31
	2015 RELA‐A	140.40	0.18	139.59c	0.58
	2015 RELA‐B	154.20	0.13	154.20c	0.00
	2016 RELA‐A	130.78	0.20	131.18c	−0.29
	2016 RELA‐B	141.55	0.24	142.08c	−0.34
K	Serum‐I	3.444	0.30	3.46b	−0.46
	Serum‐II	5.360	0.15	5.36b	0.02
	2015 RELA‐A	5.880	0.19	5.860c	0.34
	2015 RELA‐B	3.130	0.95	3.133c	−0.09
	2016 RELA‐A	4.917	0.32	4.931c	−0.28
	2016 RELA‐B	6.807	0.30	6.829c	−0.32
Mg	Serum‐I	0.732	0.39	0.73b	0.27
	Serum‐II	0.980	1.00	0.97b	1.03
	2015 RELA‐A	1.943	0.97	1.928c	0.80
	2015 RELA‐B	0.911	0.51	0.908c	0.28
	2016 RELA‐A	0.732	0.44	0.722c	1.33
	2016 RELA‐B	1.468	0.59	1.454c	0.99
Ca	Serum‐I	2.037	0.83	2.03b	0.34
	Serum‐II	3.009	0.96	2.99b	0.64
	2015 RELA‐A	3.029	0.42	3.026c	0.11
	2015 RELA‐B	1.992	0.80	2.001c	−0.46
	2016 RELA‐A	3.464	0.32	3.481c	−0.48
	2016 RELA‐B	2.513	0.45	2.526c	−0.52

^aLimits of equivalence of IFCC‐RELA: Na ± 1.25%; K ± 2.00%; Mg ± 3.75%; Ca ± 2.50%.

^bThe reference value certified by National Center for Clinical Laboratories using ICP‐MS.

^cMean of all participants