Fecal fatQuantitative stool fat determination; Fat absorption
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 food additives that could affect the test.
Food additives are substances that become part of a food product when they are added during the processing or making of that food. "Direct" food add...
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 a normal small intestine.
Malabsorption involves problems with the body's ability to take in (absorb) nutrients from food.
Bile is a fluid that is made and released by the liver and stored in the gallbladder. Bile helps with digestion. It breaks down fats into fatty acid...
Less than 7 g of fat per 24 hours.
What Abnormal Results Mean
Decreased fat absorption may be caused by:
- Biliary tumor
- Biliary stricture
- Celiac disease
- Chronic pancreatitis
- Crohn disease
- Cystic fibrosis
- Gallstones (cholelithiasis)
- Pancreatic cancer
- Radiation enteritis
- Short bowel syndrome (for example from surgery or an inherited problem)
- Whipple disease
- Small bowel bacterial overgrowth
There are no risks.
Factors that interfere with the test are:
- Mineral oil
- Inadequate fat in diet prior to and during the stool collection
Hogenauer C, Hammer HF. Maldigestion and malabsorption. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger & Fordtran's Gastrointestinal and Liver Disease. 10th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 104.
Reynolds JC, Ward PJ, Rose S, Solomon M. Small bowel. In: Reynolds JC, Ward PJ, Rose S, Solomon M, eds. Netter Collection of Medical Illustrations: Digestive System: Part II - Lower Digestive Tract, The. 2nd ed. Philadelphia, PA: Elsevier; 2017:pg 31-114.
Semrad CE. Approach to the patient with diarrhea and malabsorption. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 25th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 140.
Siddiqui UD, Hawes RH. Chronic pancreatitis. In: Chandrasekhara VD, Elmunzer JB, Khashab MA, Muthusamy RV, eds. Clinical Gastrointestinal Endoscopy. 3rd ed. Philadelphia, PA: Elsevier; 2019:chap 59.
Digestive system organs - illustration
The digestive system organs in the abdominal cavity include the liver, gallbladder, stomach, small intestine and large intestine.
Digestive system organs
Review Date: 6/21/2018
Reviewed By: Michael M. Phillips, MD, Clinical Professor of Medicine, The George Washington University School of Medicine, Washington, DC. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.