Gastrointestinal & Microbiome
SIBO Breath Test — 3-Hour Lactulose
Three-hour timed breath collection following a lactulose challenge, measuring all three fermentation gases. Many laboratories measure only hydrogen and methane, which can miss hydrogen sulphide–predominant presentations.
- Sample type
- Breath
- Turnaround
- 7–10 business days
- Fasting
- Required
- Collection
- Home visit or centre
What's measured (4 groups)
- Hydrogen (H₂) at 20-minute intervals
- Methane (CH₄)
- Hydrogen sulphide (H₂S)
- Gas curve interpretation
How to prepare
- 24-hour restricted preparatory diet (instructions provided with kit)
- Fast for 12 hours before starting the test
- No antibiotics for 4 weeks or laxatives for 1 week beforehand
Partner accredited gastroenterology laboratory
Results are released to your Meridian Health account and can be shared with your treating clinician. Lab results are best interpreted alongside your clinical history — book a consultation if you'd like to review them with a doctor.
Book This Test
$375.00Sign in to book this lab test and choose a collection slot.