Table 4.
Types of genotyping errors seen in NRAS testing
| EQA year and Run | Number of laboratories reporting genotyping errors (%) | Total number of errors reported | False positive results reported | False negative results reported | Incorrect mutation reported | Extra mutation reported (not present) |
|---|---|---|---|---|---|---|
| 2013–2014 Run 2 |
0 | 0 | 0 | 0 | 0 | 0 |
| 2013–2014 Run 3 |
5 (11.6) | 5 | 1 | 4 | 0 | 0 |
| 2014–2015 Run 1 |
7 (10.4) | 8 | 5 | 1 | 2 | 0 |
| 2014–2015 Run 2 |
8 (10.9) | 8 | 4 | 3 | 1 | 0 |
| 2015–2016 Run 1 |
22 (25.6) | 29 | 2 | 23 | 4 | 0 |
| 2015–2016 Run 2 |
4 (4.0) | 4 | 1 | 1 | 0 | 2 |