Uses 0.1 N NaOH that acts as a stool diluent; saponifies fat and frees eggs from debris - The amount of diluted stool used for egg counting is measured by stoll pipettes - Total egg count is multiplied by a factor depending on the amount of stool used - Routine: 4 g feces; multiply by factor 100 to obtain # of eggs/gram stool - Sensitivity is determined by the consistency of the stool