| DLMO | Dim light melatonin onset |
| LC-MS/MS | Liquid chromatography tandem mass spectrometry |
| LOD | Limit of detection |
| CV | Coefficient of variation |
| CDER | Center for Drug Evaluation and Research |
| SRM | Selected reaction monitoring |
| QC | Melatonin-free nails spiked at different levels |
| S/N | Signal to noise ratio |
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