It is possible to test the stool of a newborn after taking probiotics without affecting the results. Routine stool tests are performed mainly in terms of appearance and microscopic observation. Oral probiotics do not affect the appearance of the stool, such as shape and color. Microscopic examination of the stool mainly describes the presence of red and white blood cells, cell counts, the presence of parasites and worm eggs, and other abnormalities, and oral probiotics do not affect the above. The role of probiotics is mainly to regulate the intestinal flora and improve digestive symptoms. When newborns are tested for stool, try to take fresh specimens, for example, send them for testing within 1 hour of defecation, do not choose stool in diapers, the container for taking specimens should be clean to avoid affecting the normal results, and try to consult with your doctor before sending the specimens for testing.