Table 2.

Participation, passing quota and laboratory performance in the external quality assurance program EQA248 for C3-nefritic factor (C3Nef).

Laboratory	2016	2017	2018	2019	2020	2021	2022	Performance	Participation, total
1								25%	4
2								71%	7
3								0%	4
4								17%	6
5								57%	7
6								71%	7
7								100%	5
8								0%	2
9								100%	1
10								86%	7
11								86%	7
12								86%	7
13								0%	1
14								100%	4
15								43%	7
16								50%	4
17								0%	1
18								40%	5
19								100%	1
20								20%	5
21								0%	5
22								100%	3
23								0%	2
24								0%	1
25								50%	4
26								0%	2
27								33%	3
28								0%	1
Passing quota	81.8%	58.3%	43.8%	47.1%	31.3%	42.9%	70.0%
Participation, total	11	12	16	17	16	21	20

Participation: Number of submitted results in the period of 2016-2022. Performance: Percentage of submitted results in the target range for both of the samples (dark blue). Any result out of target range (light red), lack of results (white). Passing quota: Performance of laboratories in the indicated years. Bold facing: laboratories with at least four participations and at least 80% performance.