| CDS | Creatine deficiency syndrome |
| GAA | Guanidinoacetate |
| Cr | Creatine |
| Crn | Creatinine |
| LC-MS/MS | Liquid chromatography-tandem mass spectrometry |
| UPLC | Ultra-performance liquid chromatography |
| AGAT | Arginine:glycine amidinotransferase |
| GAMT | Guanidinoacetate methyltransferase |
| CRTR | Creatine transporter |
| LOD | Limit of detection |
| LOQ | Limit of quantification |
| ERNDIM | European Research Network for Evaluation and Improvement of Screening, Diagnosis and Treatment of Inherited Disorders of Metabolism |
| SAU | Special assays in urine |
| SAS | Special assays in serum |
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