1. A non-destructive method of extracting and measuring one or more metabolites from a biological sample while preserving the sample for histological analysis, comprising (a) immersing the biological sample in a solution consisting of alcohol and water, whereby one or more metabolites present in the biological sample are extracted into the solution; (b) physically separating the biological sample from the solution; and (c) analyzing the solution by measuring a level(s) of the one or more metabolites extracted into the solution, wherein the extracted metabolites are measured using one or more methods selected from the group consisting of liquid chromatography, gas chromatography, mass spectrometry, and nuclear magnetic resonance; and (d) analyzing the biological sample remains analyzable by histological analysis.