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Medtox Scientific Inc. 402 West County Road D St. Paul, Minnesota 55112 651-636-7466 - www.medtox.com Tellurium Serum or plasma. Reference range has not been established. Whole blood. Reference range has not been established. Urine, Random. Normal (unexposed population) less than 1.0 ng/ml. Exposed: Exposure to air concentrations between 0.01 and 0.1 mg/m3 resulted in urinary concentrations of 0-60 ng/ml. If average urinary concentrations for a whole shift of workers exceed 50 ng/ml, working conditions should be investigated. Toxic: Not established