How a Lactose Intolerance Test Works

Like SIBO breath testing, lactose breath tests measure hydrogen and methane gas production in your breath.

These tests typically run for 3 hours, with breath samples collected at regular intervals.

Important Testing Sequence: Testing for SIBO First

If you suspect multiple digestive issues, it’s crucial to test for SIBO before investigating fructose or lactose intolerance.

Here’s why:
– SIBO can cause false positive results on both fructose and lactose breath tests
– Bacteria present in SIBO readily ferment these sugars, leading to elevated gas levels
– This fermentation occurs regardless of whether you have true fructose or lactose malabsorption

You can read more about SIBO testing here or view our SIBO at home breath tests from VHL or Genova in the store.

When to Test for Fructose and Lactose
The optimal time to test for fructose or lactose intolerance is:
– After ruling out SIBO
– If SIBO treatment has been completed successfully
– When specific symptoms suggest carbohydrate malabsorption

This test is sourced from Viva Health Labs (VHL) and is a non-invasive breath tests which captures exhaled hydrogen after you ingest a lactulose solution. The results enable us to evaluate bacterial overgrowth in your small intestine.

(Packaging shown here is for illustration purposes only, actual packaging will vary)