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Fecal fat

Digestive system organs

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.

Alternative Names

Quantitative stool fat determination; Fat absorption

How the Test is Performed

There are many ways to collect the samples.

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 of fat per day for 3 days before starting the test. The health care provider may ask you to stop using drugs or food additives 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 malabsorption can cause a change in your stools called steatorrhea. To absorb fat normally, the body needs bile from the gallbladder (or liver if the gallbladder has been removed), enzymes from the pancreas, and normal intestines.

Normal Results

Less than 7 grams of fat per 24 hours.

What Abnormal Results Mean

Decreased fat absorption may be caused by:

Risks

There are no risks.

Considerations

Factors that interfere with the test are:

References

Hogenauer C, Hammer HF. Maldigestion and malabsorption. In: Feldman M, Friedman LS, Sleisenger MH, eds. Sleisenger & Fordtran's Gastrointestinal and Liver Disease. 9th ed. Philadelphia, PA: Elsevier Saunders; 2010:chap 101.

Semrad CE, Powell DW. Approach to the patient with diarrhea and malabsorption. In: Goldman L, Schafer AI, eds. Goldman's Cecil Medicine. 24th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 142.


Review Date: 8/19/2014
Reviewed By: Jenifer K. Lehrer, MD, Department of Gastroenterology, Frankford-Torresdale Hospital, Aria Health System, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.