|Values are valid only on day of printing.|
Dialyzed urine is mixed with the artificial substrate p-nitrocatechol sulfate. As sulfate is released, the freed p-nitrocatechol is measured in alkaline solution at 515 nm.(Baum H, Dodgson KS, Spencer B: The assay of arylsulfatases A and B in human urine. Clin Chim Acta 1959;4:453-455)
Specimens are processed on Monday. Assay is performed on Tuesday; 8 a.m.