Diagnostic and diagnosis method for central nervous abnormality and phenylketonuria

摘要

PCT No. PCT/JP96/02206 Sec. 371 Date Apr. 1, 1997 Sec. 102(e) Date Apr. 1, 1997 PCT Filed Aug. 6, 1996 PCT Pub. No. WO97/05906 PCT Pub. Date Feb. 20, 1997There is provided a diagnostic for central nervous abnormality, comprising a labeled transmitter substance of central nervous system or a labeled precursor of the transmitter substance, whose at least one of carbon atoms is substituted for a carbon isotope wherein the diagnostic is useful for diagnosing a central nervous abnormality (e.g. depression, Alzheimer's disease, schizophrenia, etc.) by applying it to a living body by oral administration or injection and examining a change in an amount of the carbon isotope in a breath of the living body.