title: Variations in plasma drug levels from different laboratories.
mesh_terms: D000368:Aged; D001774:Blood Chemical Analysis; D002849:Chromatography, Gas / Q000592:standards; D002851:Chromatography, High Pressure Liquid / Q000592:standards; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007753:Laboratories / Q000592:standards*; D014196:Trazodone / Q000097:blood*
chemical_list: D014196:Trazodone