No, you do not need to refrigerate your sample. The stool tube contains a solution in which your bacteria can survive the transport to our laboratory even without refrigeration. No matter if it is summer or winter - the postal shipment cannot influence your results.
The preservation liquid stabilizes the sample for several months without refrigeration. This is very important for us because we analyze the balance and distribution of intestinal bacteria. So you don't need to worry if the postal delivery takes longer."