Lactobacillus count (stool culture with selective medium)

What Does This Test Measure?

The test looks for live Lactobacillus bacteria in your stool sample. These bacteria are part of your gut microbiome and play a role in maintaining healthy digestion and immune function. The result may indicate whether these beneficial bacteria are present in sufficient numbers.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like persistent diarrhea, bloating, or digestive discomfort, especially if antibiotics were recently taken. It can also help diagnose or monitor conditions like small intestinal bacterial overgrowth (SIBO) or certain infections.

How Is the Test Performed?

A small sample of your stool is collected in a sterile container. The sample is then sent to a lab where it is cultured on a special medium that supports the growth of Lactobacillus bacteria. After incubation, the lab checks for bacterial growth to determine if these beneficial bacteria are present.

What Are the Possible Results?

Results are qualitative (positive or negative) rather than numerical. A positive result means Lactobacillus bacteria were detected in your stool sample. A negative result suggests they were not found, which may prompt further evaluation of your gut health.