Diagnostic category	Biomarker probability of AD aetiology	Aβ (PET or CSF)	Neuronal injury (tau, FDG, sMRI)
MCI‐core clinical criteria	Uninformative	Conflicting/indeterminant/untested	Conflicting/indeterminant/untested
MCI due to AD – intermediate likelihood	Intermediate	Positive	Untested
MCI due to AD – high likelihood	Highest	Untested Positive	Positive Positive
MCI – unlikely due to AD	Lowest	Negative	Negative
Aβ: amyloid beta peptide; AD: Alzheimer's disease; CSF: cerebrospinal fluid; FDG: fluorodeoxyglucose; MCI: mild cognitive impairment; sMRI: structural magnetic resonance imaging; PET: positron emission tomography