Table 1: NIST SRM32752 (Fish oil standard) Precision and Accuracy using the NIST fish oil standard, N = 24 over five different days and two different months. The mean ± 2σ represents the 95% confidence interval of measurements in our laboratory. The NIST lower and upper limits, and the NIST target, also represents the 95% confidence interval, but is based on the concentrations listed on the Certificate of Analysis. The upper limit was calculated using the highest denominator and the lowest numerator; the lower limit was calculated with the lowest numerator and highest denominator. The target was calculated simply by adding the values. Values are in µg unless otherwise specified.

ω6 LA 
ω3 ALA 
ω6 AA 
ω3 EPA 
ω3 DHA 
ω3 sum 
ω6 sum 
ω6/ω3 
Mean 
0.37 
0.30 
2.8 
45.3 
21.3 
66.9 
3.2 
0.048 
σ 
0.03 
0.04 
0.2 
3.1 
1.4 
4.5 
0.2 
0.001 
2σ 
0.06 
0.08 
0.4 
6.2 
2.8 
9.0 
0.4 
0.002 
CV 
8% 
13% 
6% 
7% 
7% 
7% 
6% 
2% 
Mean2σ 
0.3 
0.2 
2.5 
39.1 
18.5 
57.9 
2.8 
0.046 
Mean+2σ 
0.4 
0.4 
3.2 
51.5 
24.1 
75.9 
36 
0.050 
NIST TARGET 
0.3 
0.2 
2.7 
45.8 
21.7 
69.3 
3.2 
0.044 
NIST LOWER 
0.3 
0.2 
2.5 
43.8 
20.8 
64.8 
2.8 
0.040 
NIST UPPER 
0.4 
0.2 
2.9 
47.8 
22.7 
70.7 
3.2 
0.049 