title: Classification of subjects as slow or rapid inactivators of isoniazid based on the ratio of acetylisoniazid to isoniazid in urine determined by a simple colorimetric method.
mesh_terms: D003124:Colorimetry; D006801:Humans; D007538:Isoniazid / Q000031:analogs & derivatives* / Q000378:metabolism* / Q000652:urine; D013053:Spectrophotometry
chemical_list: D007538:Isoniazid