Top of the page
Lactose intolerance tests measure how well your intestines break down lactose, a type of sugar found in milk and other dairy products. The guidelines below will help you adjust your diabetes medicine as you get ready for your test.
If you see a diabetes educator or diabetes specialist, contact them at least 1 week before your test to ask about adjusting your diabetes medicine or insulin.
Follow the instructions the gastroenterology (GI) clinic gives you about when and what to eat or drink before the test. You'll have to drink liquid that has 26.3g of lactose for the test.
Test your glucose anytime you feel your glucose is low or high.
If you take insulin
The day before your test
The day of your test
Basal insulin: Reduce your dose of basal insulin (Basaglar, Humulin N, Lantus, Levemir, Novolin NPH, Semglee, Toujeo, or Tresiba) by 20% or the amount your healthcare provider tells you. You may need to reduce Tresiba 2-3 days before the test. Talk with your healthcare provider. Write out your dose so it is easier to remember: Your dose will be __________ units.
*Be sure to bring a source of fast-acting sugar and your glucose monitor to the test with you.
After your test
If you take diabetes medicine other than insulin
The day of your test
To see this information online and learn more, visit MyHealth.Alberta.ca/health/pages/conditions.aspx?Hwid=custom.ab_diabetes_hydrogenbreathtest_li_inst.
For 24/7 nurse advice and general health information call Health Link at 811.
Current as of: July 19, 2023
Author: Endocrinology and Metabolism Program, Alberta Health Services
This material is not a substitute for the advice of a qualified health professional. This material is intended for general information only and is provided on an "as is", "where is" basis. Although reasonable efforts were made to confirm the accuracy of the information, Alberta Health Services does not make any representation or warranty, express, implied or statutory, as to the accuracy, reliability, completeness, applicability or fitness for a particular purpose of such information. Alberta Health Services expressly disclaims all liability for the use of these materials, and for any claims, actions, demands or suits arising from such use.