Table 4.
Relative recovery and precision of organic acids added in aqueous calibrator and urine calibrator
| Organic acid | Relative recovery (%) | Intraday imprecision (n = 24) | Interday imprecision (n = 24) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Aqueous calibrator | Urine calibrator | Aqueous calibrator mean conc. (mmol/l) | CV (%) | Urine calibrator mean conc. (mmol/l) | CV (%) | Aqueous calibrator mean conc. (mmol/l) | CV (%) | Urine calibrator mean conc. (mmol/l) | CV (%) | |
| Lactate | 72.5 | 72.75 | 9.9 | 1.2 | 9.7 | 0.01 | 9.2 | 0.9 | 9.7 | 3.0 |
| Oxalic acid | 104.75 | 113.25 | 13.9 | 0.8 | 15.1 | 4.6 | 14.1 | 1.7 | 15.1 | 4.6 |
| Pyruvate | 91.75 | 81.75 | 12.4 | 1.6 | 11 | 4.2 | 11.9 | 3.4 | 10.7 | 7.8 |
| Methylmalonic acid | 97.5 | 99 | 12.8 | 0.04 | 13.5 | 9.1 | 13.4 | 1.2 | 5.6 | 1.6 |
| Ethylmalonic acid | 83.25 | 83 | 9.9 | 1.2 | 10.4 | 1.4 | 13.5 | 0.9 | 6.4 | 2.9 |
| Fumaric acid | 74 | 75.25 | 9.9 | 0.7 | 10.7 | 3.9 | 9.8 | 0.06 | 7.7 | 1.4 |
| Lactic acid dimer | 104.5 | 98.5 | 14 | 0.05 | 12.8 | 1.2 | 13.8 | 0.01 | 3.8 | 1.0 |
| Glutaric acid | 119.5 | 118.5 | 15.9 | 1.0 | 15.8 | 1.6 | 16 | 1.0 | 5.8 | 2.5 |
| 3Methylglutaric acid | 82.5 | 127.5 | 10.8 | 0.5 | 17 | 0.1 | 11.4 | 1.0 | 27.0 | 0.4 |
| 3Phenylbutyric acid | 71.75 | 84.75 | 9.9 | 0.1 | 11.3 | 2.7 | 8.9 | 3.8 | 4.3 | 3.0 |
| Succinylacetone | 77 | 83.25 | 10.5 | 0.07 | 11.1 | 4.1 | 9.8 | 6.3 | 11.1 | 2.9 |
| Adipic acid | 109 | 105.75 | 14.5 | 1.3 | 14.1 | 0.9 | 14.6 | 2.7 | 14.1 | 2.3 |
| Suberic acid | 134.75 | 133.5 | 18 | 1.0 | 17.8 | 0.5 | 17.9 | 1.2 | 17.8 | 0.3 |
| Azelaic acid | 88.75 | 98.25 | 10.9 | 1.9 | 13.4 | 1.4 | 13.7 | 1.2 | 6.5 | 1.4 |
| Sebacic acid | 56.25 | 56 | 7.5 | 2.6 | 7.3 | 6.9 | 7.5 | 9.8 | 7.8 | 1.9 |
| Orotic acid | 66.75 | 67.75 | 8.9 | 5.1 | 9.6 | 5.5 | 8.9 | 4.8 | 4.0 | 6.8 |