Sample concentration
(ng/ml)

Fresh sample concentration
(ng/ml)

Sample concentration after storage(ng/ml)

%CV

%Bias

Short term (24hr)

        2.94

        2.97

2.88

1.73

-2.30

800

795.11

780.24

1.37

-2.75

Three Freeze thaw cycles

2.94

        2.94

2.80

1.34

-0.98

800

804.86

781.20

2.31

-2.25

Auto sampler stability (24 hr)

2.94

2.99

2.91

1.76

-1.46

800.00

814.23

785.65

1.54

2.35

Long term 30 days  
(-85°C)

2.94

2.93

           2.76

2.79

-2.33

800.00

797.25

760.21

1.31

-3.70