Proficiency testing results for methylmalonic acid, vanillylmandelic acid, and homovanillic acid
| Variable | Trial | Specimen no. | No. | Median | Minimum | Maximum |
|---|---|---|---|---|---|---|
| Methylmalonic acid (mg/L) | ||||||
| 2020 | 1st | CMM-20-01 | 4 | 0.90 | 0.70 | 1.00 |
| CMM-20-02 | 17.60 | 13.40 | 19.00 | |||
| CMM-20-03 | 43.70 | 32.90 | 47.40 | |||
| 2nd | CMM-20-04 | 4 | 4.10 | 3.90 | 4.30 | |
| CMM-20-05 | 39.40 | 37.60 | 41.10 | |||
| CMM-20-06 | 16.40 | 14.60 | 17.60 | |||
| 2021 | 1st | CMMA-21-01 | 5 | 1,390.00 | 1,360.20 | 1,550.00 |
| CMMA-21-02 | 665.70 | 530.00 | 707.20 | |||
| CMMA-21-03 | 267.30 | 238.40 | 278.30 | |||
| 2nd | CMMA-21-04 | 5 | 651.50 | 600.00 | 702.90 | |
| CMMA-21-05 | 160.00 | 137.40 | 180.00 | |||
| CMMA-21-06 | 1,146.50 | 1,054.50 | 1,150.00 | |||
| Vannillymandelic acid (mg/L) | ||||||
| 2020 | 1st | CMV-20-01 | 7 | 15.60 | 12.40 | 16.50 |
| CMV-20-02 | 3.70 | 2.50 | 4.70 | |||
| CMV-20-03 | 38.60 | 27.70 | 45.90 | |||
| 2nd | CMV-20-04 | 7 | 28.60 | 27.00 | 31.80 | |
| CMV-20-05 | 10.50 | 9.70 | 11.60 | |||
| CMV-20-06 | 4.40 | 3.90 | 4.90 | |||
| 2021 | 1st | CMVH-21-01 | 7 | 24.60 | 22.90 | 25.40 |
| CMVH-21-02 | 3.30 | 3.00 | 4.50 | |||
| CMVH-21-03 | 9.00 | 8.30 | 9.60 | |||
| 2nd | CMVH-21-04 | 7 | 38.90 | 36.10 | 40.90 | |
| CMVH-21-05 | 4.90 | 4.60 | 5.70 | |||
| CMVH-21-06 | 2.60 | 2.10 | 2.80 | |||
| Homovanillic acid (mg/L) | ||||||
| 2021 | 1st | CMVH-21-01 | 5 | 22.10 | 18.50 | 27.10 |
| CMVH-21-02 | 3.40 | 2.90 | 3.90 | |||
| CMVH-21-03 | 8.10 | 6.90 | 9.70 | |||
| 2nd | CMVH-21-04 | 5 | 13.90 | 11.20 | 15.10 | |
| CMVH-21-05 | 6.00 | 4.60 | 6.60 | |||
| CMVH-21-06 | 3.10 | 2.30 | 3.30 |