Table 1 Main results of 6 years and 7 surveys for the seminal biomarkers EQA program

 Median (IQR), mmol/L

27.60 (5.27)

24.00 (2.96)

26.60 (0.87)

29.1 (0.1)

27.59 (4.42)

28 (4.06)

28.80 (2.3)

27.6

 CD, %

11.05

5.54

1.77

0.34

10

4.64

4.34

4.64

 Number of laboratories

6

4

5

5

6

7

6

6

 Consistent results^a (%)

3 (50)

3 (75)

5 (100)

4(80)

3 (50)

4 (57)

5 (83)

75^b

 Median (IQR), mmol/L

2.02 (0.14)

NA

1.70 (0.14)

2.31 (0.30)

2.20 (0.57)

2.00 (0)

2.25 (0.26)

2.11

 CD, %

3.96

NA

7.65

10.82

11.8

0

8.44

8.04

 Number of laboratories

5

1

3

3

4

5

5

4

 Consistent results^a (%)

5 (100)

NA

3 (100)

3 (100)

3 (75)

5 (100)

4 (80)

100^b

 Median (IQR), mmol/L

14.43 (3.2)

17.76 (3.23)

14.65 (1.00)

16.20 (0.80)

15.00 (1.29)

16.00 (2.45)

16 (1.78)

16

 CD, %

19.2

5.80

4.44

2.47

1.23

6.25

6.25

5.8

 Number of laboratories

7

6

5

5

6

7

6

6

 Consistent results^a (%)

2 (29)

2 (33)

5 (100)

5 (100)

4 (67)

5 (71)

4 (67)

67 ^b

 Median (IQR), UI/L

20 (2.2)

17.65 (4.4)

17.60 (2.96)

21.85 (2.60)

19.16 (3.21)

20 (0.75)

18.75 (4.5)

19.16

 CD, %

4

12.42

11.70

6.63

10.8

2.5

11.98

10.8

 Number of laboratories

5

6

5

4

6

6

6

6

 Consistent results^a (%)

4 (67)

4 (67)

3 (60)

3 (75)

5 (83)

5 (83)

5 (83)

75 ^b