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It is very important that these instructions are adhered to prior to tests at Biolab (unless your doctor specifically advises you otherwise).
Trace elements: No supplements on the day of the test.
Antioxidant screen: No supplements on the day of the test.
Bile acids: No food for at least 3 hours prior to the test or record the time since the last meal.
Breath Hydrogen: No food overnight prior to the test.
D-Xylose tolerance test: Fasting from 10pm the previous evening.
Glucose tolerance tests: Fasting from midnight the previous evening.
Gut fermentation profile: No food for 3 hours and no alcohol for 24 hours before the test.
Health risk profile: Preferably no supplements on the day of the test.
Lactose tolerance test: Fasting from 10pm the previous evening.
Lipids: 14 hour fast.
Osteoporosis profile: Preferably no supplements on the day of the test.
Zinc tolerance test: Fasting from 10pm the previous evening. | 
