The laboratories have various expenses for different steps in handling an analysis. These are connected to the lab-work (sample handling, calibration, blind tests, internal standards, etc), and to the administration of the analysis (registration, reporting, etc).
Obviously the prices for single analysis are higher than for a series of samples. For larger number of samples to be analysed (>10), we offer a discount in price. This discount depends on kind and number of samples, and the analytical methods that have to be used.