Ordering a Helicobacter pylori Urea Breath Test
Order the test as: "Helicobacter pylori urea breath test (13C-UBT preferred). Patient must discontinue PPIs for 2 weeks and antibiotics/bismuth for 4 weeks prior to testing. Schedule test at least 4 weeks after completion of any H. pylori eradication therapy."
Essential Order Components
Test Name and Preference
- Specify 13C-urea breath test (stable isotope) rather than 14C when available 1
- The 13C version avoids radiation exposure while maintaining 95-100% sensitivity and specificity 1
Critical Medication Washout Instructions
Your medical assistant must communicate these washout periods to the patient:
- Proton pump inhibitors (PPIs): Stop 2 weeks before test 2, 3
- Antibiotics: Stop 4 weeks before test 3, 4
- Bismuth compounds: Stop 4 weeks before test 4
- H2-receptor antagonists: Stop at least 5 days before test 1
These medications suppress H. pylori activity and cause false-negative results 4, 5. The sensitivity of the urea breath test is significantly affected by antisecretory drugs and antibiotics 5.
Timing After Treatment
If this test is for post-eradication confirmation (test-of-cure), schedule 4-8 weeks after completion of therapy 2, 3. Testing earlier risks false-negative results from temporary bacterial suppression rather than true eradication 3, 1.
Sample Order Verbiage
"H. pylori urea breath test (13C-UBT). Patient instructions: discontinue all PPIs x 2 weeks, antibiotics/bismuth x 4 weeks prior to test. If post-treatment, schedule minimum 4 weeks after therapy completion. Fasting required per lab protocol."
Clinical Context
The urea breath test is the gold standard non-invasive method for confirming eradication success 2 and is preferred over serology, which cannot distinguish active from past infection within 6-12 months post-treatment 3. The Maastricht IV consensus specifically recommends UBT as the preferred non-invasive test for determining eradication success 2.