| Level | Name | Requirements |
|---|---|---|
| 1 | Basic Screening | Plasma NAD+, MMSE/MoCA, Aβ42/40 ratio |
| 2 | Comprehensive Assessment | Full NAD+ index, p-tau, MRI volumetrics |
| 3 | Precision Diagnosis | CSF biomarkers, PET imaging, enzyme profiles |
| 4 | Research Grade | Longitudinal tracking (12+ months), omics profiling |