Intra-day (n=4)

Inter-day (n=5)

Concentration (ng/mL)

Serum    

sample

Synovial fluid sample

Serum    

sample

Synovial fluid sample

 

Obtained

(mean ± SD)

Obtained

(mean ± SD)

Obtained

(mean ± SD)

Obtained

(mean ± SD)

30

29.00 ± 1.29

29.50 ± 1.29

29.00 ± 0.82

29.25 ± 1.26

50

49.20 ± 2.06

49.50 ± 1.00

49.75 ± 2.22

49.51 ± 2.38

100

98.75 ± 2.22

99.00 ± 0.82

100.25 ± 2.06

99.15 ± 0.91

200

200.75 ± 1.26

197.50 ± 9.57

199.25 ± 1.89

195.25 ± 9.74

500

499.25 ± 2.75

497.50 ± 20.61

500.25 ± 3.30

496.00 ± 7.62

1000

1006.50 ± 10.66

994.75 ± 19.06

1015.00 ± 1915

986.00 ± 6.97

1500

1498.25 ± 11.14

1480.00 ± 8.17

1509 ± 12.15

1496.25 ± 10.40

2000

2000.75 ± 3.86

1885.00 ± 81.85

2011.75 ± 19.62

1993.25 ± 17.29

2500

2498.50 ± 7.416

2470.00 ± 14.14

1497.75 ± 11.79

2497.75 ± 17.69

3000

2997.50 ± 7.59

2908.25 ± 53.56

2997.50 ± 14.53

3011.25 ± 29.41

Table 1: Intra- and inter day precision.
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