title: Interlaboratory evaluation of proficiency testing in urinary delta-aminolevulinic acid analyses.
mesh_terms: D004355:Drug Stability; D005069:Evaluation Studies as Topic; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007855:Lead Poisoning; D007982:Levulinic Acids / Q000652:urine*; D008722:Methods; D013696:Temperature; D013997:Time Factors
chemical_list: D007982:Levulinic Acids