Diagnosing fat malabsorption due to pancreatic or intestinal disorders.
Monitoring effectiveness of enzyme supplementation in certain malabsorption disorders.
For 3 days prior to collection:
- Patient should be on fat controlled diet (100-150g per day) - No laxatives (particularly mineral oil and castor oil) - No synthetic fat substitutes (eg Olestra) or fat blocking nutritional supplements - No use of diaper rash ointments as they will falsely elevate test results - Barium interferes with test procedure; a waiting period of 48 hours before stool collection is recommended - The length of collection must be given in the order with the # of containers label #1, #2, etc...
Must use Mayo collection containers (supply T291) provided by Marshfield Labs.
Timed Collection: >=18 years: 2-7 g fat/24 hours
Reference Values have not been established for patients who are less than 18 years of age.
Excretion of >7 grams fat/24 hours, when on a diet of 100 to 150 g of fat, is suggestive of a malabsorption defect.
Abnormal results from a random specimen should be confirmed by submission of a timed collection.
Test values for timed fecal fat collections will be reported in terms of g/24 hours; the duration of the collection may be 24, 48, 72, or 96 hours. Test values for random fecal fat collections will be reported in terms of percent fat.
NOTE: This test is not useful for differentiating among pancreatic diseases.