Lactose · Fructose · Glucose Breath Test

Important: If you do not follow the preparation instructions or dietary recommendations, the test will not be performed.

Preparation

Discontinue 4 weeks before the test:

• Antibiotics
• Bismuth-containing medications

Discontinue 2 weeks before the test:

• Probiotics (e.g., Linex)
• Laxatives (e.g., Guttalax)
• Gastric acid-suppressing medications (e.g., Omeprazole)

Do not undergo the following procedures:

• Colonoscopy
• Gastrointestinal examinations using barium contrast
• Enema

Important: If you have diarrhea, the test will be postponed.

Diet (2–3 Days Before the Test)

✔ Allowed foods:

• White bread
• Rice
• Potatoes
• Boiled chicken
• Eggs
• Boiled fish
• Unsweetened coffee or tea
• Water

❌ Avoid:

• Beans
• Pasta
• Oats
• Barley
• Whole-grain bread
• Dried fruit
• Berries
• Raw or fried vegetables

Diet (The Day Before the Test)

✔ Allowed foods:

• Boiled rice
• Boiled chicken or fish
• Unsweetened coffee or tea
• Water

12 Hours Before the Test

• ❌ Do not eat any food.
• ✔ You may drink water only.
• If you take medications for chronic conditions, you may continue taking them with water.
• If you have diabetes, consult your endocrinologist in advance regarding adjustment of your insulin or oral diabetes medication.

On the Day of the Test

• ❌ Do not eat or drink anything.
• ✔ You may brush your teeth without using mouthwash.

Do not use:

• Chewing gum
• Tobacco products
• Lozenges or hard candies

Additional Instructions

• ❌ Do not sleep during the hour before the test.
• ❌ Avoid physical exercise before the test.
• ❌ Eating or drinking during the test is strictly prohibited.

Test duration: 30 minutes to 3 hours

Minimum interval between breath tests: 2 days