| C peptide | < 1.51 ng per mL (0.5 nmol per L): PPV of 96 percent for diagnosis in adults and children20 | > 1.51 ng per mL: NPV of 96 percent for diagnosis in adults and children20 | Not available | $30 |
| GADA | 60 percent prevalence in adults and children21 | 7 to 34 percent prevalence in adults and children23,24 | Presence: PPV of 92 percent for requiring insulin at three years in persons 15 to 34 years of age26 | $28 |
| 73 percent prevalence in children22 | NPV of 94 percent for requiring insulin at six years in adults25 | Absence: NPV of 49 percent for requiring insulin at three years in persons 15 to 34 years of age26 |
| IA-2α and IA-2β † | 40 percent prevalence in adults and children21 | 2.2 percent prevalence in adults25 | PPV of 75 percent for requiring insulin at three years in persons 15 to 34 years of age26 | Cost not available |
| 86 percent prevalence in children27 |
| ICA | 75 to 85 percent prevalence in adults and children21 | 4 to 21 percent prevalence in adults24 | PPV of 86 percent for requiring insulin at three years in persons 15 to 34 years of age26 | $28 |
| 84 percent prevalence in children22 |