. Author manuscript; available in PMC: 2017 May 26.

Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2016 Sep 14;1036-1037:170–177. doi: 10.1016/j.jchromb.2016.09.018

Table 4.

Intra-assay and inter-assay accuracy and precision of DHA measurement in urine samples.

QC Level	Concentration (ng/mL)	Intraday (n = 6)		Interday (n = 3)

		%CV^a	%Bias^b	%CV^a	%Bias^b
LLOQ	100	8.3	3.3	7.8	0.5
QC-low	300	5.7	−2.0	5.4	−4.6
QC-medium	800	4.7	6.5	7.4	3.1
QC-high	2000	4.5	8.5	3.4	4.4

Calibration range 100-5000 ng/mL, R² = 0.9989 with weighing factor 1/X

QC, quality control; LLOQ, lower limit of quantification; CV, coefficient of variation.

% RSD = (standard deviation/mean) × 100.

%Bias = (mean calculated concentration – nominal concentration)/(nominal concentration) × 100.