No. ColiMinder measures enzymatic activity in mMFU / 100 ml (Modified Fishman Units per 100 ml), which is the scientifically defined unit for β-D-Glucuronidase activity. mMFU values are not directly convertible to CFU because enzymatic activity reflects the metabolic state of living cells, not just their count. However, mMFU correlates well with E. coli concentrations and is validated against culture methods in multiple peer-reviewed studies. The correlation is confirmed in your specific application during the initial validation phase.