Proficiency testing results for methylmalonic acid, vanillylmandelic acid, and homovanillic acid
| Variable | Trial | Specimen no. | No. | Median | Minimum | Maximum |
|---|---|---|---|---|---|---|
| Methylmalonic acid (nmol/L) | ||||||
| 2022 | 1st | CMMA-22-01 | 5 | 110.0 | 95.0 | 124.8 |
| CMMA-22-02 | 630.0 | 610.0 | 659.1 | |||
| CMMA-22-03 | 360.0 | 340.0 | 411.3 | |||
| 2nd | CMMA-22-04 | 5 | 885.0 | 811.0 | 950.1 | |
| CMMA-22-05 | 148.5 | 138.0 | 220.0 | |||
| CMMA-22-06 | 340.0 | 312.0 | 370.0 | |||
| 2023 | 1st | CMMA-23-01 | 5 | 198.0 | 170.4 | 280.0 |
| CMMA-23-02 | 807.0 | 699.1 | 823.0 | |||
| CMMA-23-03 | 564.8 | 537.4 | 650.0 | |||
| 2nd | CMMA-23-04 | 5 | 89.6 | 81.9 | 133.7 | |
| CMMA-23-05 | 256.9 | 252.0 | 272.5 | |||
| CMMA-23-06 | 681.0 | 661.6 | 697.0 | |||
| Vanillylmandelic acid (mg/L) | ||||||
| 2022 | 1st | CMVH-22-01 | 7 | 22.4 | 20.4 | 25.1 |
| CMVH-22-02 | 12.3 | 11.2 | 13.2 | |||
| CMVH-22-03 | 2.1 | 1.8 | 2.7 | |||
| 2nd | CMVH-22-04 | 7 | 21.2 | 20.3 | 23.6 | |
| CMVH-22-05 | 9.4 | 8.9 | 10.7 | |||
| CMVH-22-06 | 3.0 | 2.6 | 3.6 | |||
| 2023 | 1st | CMVH-23-01 | 7 | 19.8 | 2.2 | 22.1 |
| CMVH-23-02 | 8.7 | 8.3 | 9.2 | |||
| CMVH-23-03 | 2.2 | 1.7 | 17.9 | |||
| 2nd | CMVH-23-04 | 7 | 2.6 | 2.2 | 2.9 | |
| CMVH-23-05 | 6.9 | 6.2 | 7.0 | |||
| CMVH-23-06 | 16.7 | 15.9 | 18.5 | |||
| Homovanillic acid (mg/L) | ||||||
| 2022 | 1st | CMVH-22-01 | 5 | 22.6 | 13.8 | 32.5 |
| CMVH-22-02 | 10.7 | 8.6 | 11.7 | |||
| CMVH-22-03 | 2.0 | 1.7 | 2.1 | |||
| 2nd | CMVH-22-04 | 5 | 20.2 | 17.2 | 22.1 | |
| CMVH-22-05 | 9.2 | 8.2 | 10.9 | |||
| CMVH-22-06 | 3.1 | 2.8 | 3.5 | |||
| 2023 | 1st | CMVH-23-01 | 6 | 18.5 | 2.3 | 20.2 |
| CMVH-23-02 | 7.8 | 6.1 | 8.8 | |||
| CMVH-23-03 | 2.5 | 2.3 | 17.5 | |||
| 2nd | CMVH-23-04 | 6 | 1.9 | 1.7 | 2.0 | |
| CMVH-23-05 | 7.1 | 6.7 | 7.7 | |||
| CMVH-23-06 | 17.3 | 16.8 | 20.2 |