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Fecal fat

Definition

The fecal fat test measures the amount of fat in the stool. This can help gauge the percentage of dietary fat that the body does not absorb.

How the Test is Performed

There are many ways to collect the samples.

  • For adults and children, you can catch the stool on plastic wrap that is loosely placed over the toilet bowl and held in place by the toilet seat. Then put the sample in a clean container. One test kit supplies a special toilet tissue that you use to collect the sample, then put the sample in a clean container.
  • For infants and children wearing diapers, you can line the diaper with plastic wrap. If the plastic wrap is placed properly, you can prevent mixing of urine and stool. This will provide a better sample.

    • Collect all stool that is released over a 24-hour period (or sometimes 3 days) in the containers provided. Label the containers with name, time, and date, and send them to the lab.

    How to Prepare for the Test

    Eat a normal diet containing about 100 grams (g) of fat per day for 3 days before starting the test. The health care provider may ask you to stop using drugs or that could affect the test.

    How the Test will Feel

    The test involves only normal bowel movements. There is no discomfort.

    Why the Test is Performed

    This test evaluates fat absorption to tell how well the liver, gallbladder, pancreas, and intestines are working.

    Fat can cause a change in your stools called steatorrhea. To absorb fat normally, the body needs from the gallbladder (or liver if the gallbladder has been removed), enzymes from the pancreas, and a normal small intestine.

    Normal Results

    Less than 7 g of fat per 24 hours.

    What Abnormal Results Mean

    Decreased fat absorption may be caused by:

  • Biliary
  •  (sprue)
  • Gallstones ()
  • Pancreatitis
  • (for example from surgery or an inherited problem)
  • Small bowel bacterial overgrowth

    • Risks

    There are no risks.

    Considerations

    Factors that interfere with the test are:

  • Enemas
  • Laxatives
  • Mineral oil
  • Inadequate fat in diet prior to and during the stool collection

    • References

    Huston CD. Intestinal protozoa. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 11th ed. Philadelphia, PA: Elsevier; 2021:chap 113.

    Semrad CE. Approach to the patient with diarrhea and malabsorption. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 131.

    Siddiqui UD, Hawes RH. Chronic pancreatitis. In: Chandrasekhara V, Elmunzer JB, Khashab MA, Muthusamy RV, eds. Clinical Gastrointestinal Endoscopy. 3rd ed. Philadelphia, PA: Elsevier; 2019:chap 59.

    Schedule An Appointment

    Contact Atlanta Obsetrics and Gynaecology at The Womens Center Millennium Hospital - 404-ATL-BABY

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    Review Date: 7/30/2022

    Reviewed By: Michael M. Phillips, MD, Emeritus Professor of Medicine, The George Washington University School of Medicine, Washington, DC. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.