An object of the present invention is to provide an evaluation method that can provide reliable information that can be used as a reference in knowing the state of mild cognitive impairment. In the present embodiment, α-ABA, Ala, Arg, Asn, Cit, Glu, Gin, Gly, His, Ile, Leu, Lys, Met, Orn, Phe, Pro, Ser, Thr, Trp, Tyr, Val, Taurine, 1-MeHis, 3-MeHis, aAAA, aAiBA, ADMA, Allyl Cys, bABA, bAiBA, Cystathionine, Cysteinic acid, EtGly, GABA, hArg, Hypotaurine, Hypro, Kyn, Pyrazole-1-Ala, Concentration values of MCSO, MeCys, N6-AcLys, N8-AcSpd, Opthalmic acid, PEA, Pipecolic acid, Put, Sar, SDMA, Spd, Spm and Thioproline and Alb, Folate, WBC, RBC, Hb, Ht and PLT tests At least one of the values is used to evaluate the status of mild cognitive impairment for the subject to be evaluated.
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