Databases and analysis used according to biofluid type. ACD, advanced chemistry development; CFM-ID, competitive fragmentation modeling for metabolite identification; FIA–MS, flow injection assay–mass spectroscopy; GC, gas chromatography; HMDB, Human Metabolome Database; H-NMR, proton nuclear magnetic resonance; LC, liquid chromatography; MS, mass spectroscopy; MSI–CE–MS, multi-segment injection–capillary electrophoresis–mass spectrometry; TOCSY, total correlation spectroscopy; UPLC, ultra-high-performance liquid chromatography; KEGG, Kyoto Encyclopedia of Genes and Genomes database; NIST, National Institute of Standards and Technology; MSI, Metabolomics Standard Initiative. ∗In silico fragmentation tools, such as CFM-ID and FingerID.