A confirmation test on a positive bilirubin by dip stick method is highly recommended because as few as 1 out of 4 or 5 is only true positive. By the way, Ictotest has not been available for almost a year and won't be available, if at all, until sometime in 2014. A replacement test called ICTOCHECK is now available from Biorex Labs. This test uses a disc instead of a tablet. For details of confirmation test, see Dr. Robert Novak's write up in "CAP Today" under urine bilirubin.