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Pathology and Laboratory Medicine
Test Catalogue
Fecal Fat


​ ​Ordering Recommendation

Patient preparation Instruction:
For 3-5 days prior to and during the collection period:
    • Patient should be on a fat-controlled diet (100-150g fat per day)
    • No laxatives (particularly mineral oil and castor oil)
    • No synthetic fat substitutes (e.g. Olestra) or fat-blocknig nutritional supplements
    • Avoid medications that interfere fat absorption during the collection
The use of diaper rash ointments will falsely elevate test results. Discontinue use during collection period
Barium interferes with this test procedure; a waiting period of 48 hours before stool collection analysis is recommended

Specimen Requirements​ ​

  • Feces-72, 48, 24 or random collection

​Collection Procedure
​Required Volume
  • Optimal Volume: Entire 24, 48, or 72 hour collection
  • Minimum Volume: The entire collection must contain at least 5 grams of feces. For a random collection, a minimum of 5 grams is required (do not send the entire collection)
    (Submitting the minimum volume makes it impossible to repeat the test or perform confirmatory/reflex testing. In some situations, a minimum volume may require a second collection)
  • Refrigerated: 180 days. Frozen: 180 days (preferred)
Grounds for Rejection​

Testing Information​ ​

  • Shipped weekly
Testing Site​
  • Referred out by St. Paul's Hospital Laboratory Mayo Medical Laboratories (Rochester, MN)
​Results Reporting
  • ​3 day turnaround time by referral laboratory
  • Nuclear Magnetic Resonance (NMR) Spectroscopy
Additional Comments
  • Diagnosing fat malabsorption due to pancreatic or intestinal disorders
  • Monitoring effectiveness of enzyme supplementation in certain malabsorption disorders
  • Reference ranges have not been established for patients who are < 18 years of age
​Alternate Test Names
  • Stool, Fat
  • Fecal Fat, Quantitative
  • Lipids, Stool
​SHR LIS Test Code
  • ​MISTC (For Laboratory Use Only)

Testing Ordering Requirements​ ​

Forms Required

If you choose to print this information, it is valid only on date of print.

Laboratory Controlled Document LSM-996 v1

Last Modified: Monday, December 2, 2019 |
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