| BTD | Biotinidase deficiency |
| C5-OH | 3-hydroxyisovaleryl-carnitine |
| C3 | Propionylcarnitine |
| 3-HIVA | 3-hydroxyisovaleric acid |
| UPLC-MS/MS | Ultra-performance liquid chromatography–tandem mass spectrometry |
| GCMS | Gas chromatography–mass spectroscopy |
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