Fat, Feces, Quantitative, Timed Collection

Abbrev Code:SFATQT   
Order Code:LAB392Order Name:Fat Stool Quantitative, Timed
Synonyms:Fecal Fat, Quantitative
Methodology:NMR spectroscopy
CPT Codes: 82710 x1
Turnaround Time:Specimens are sent to the reference laboratory Mon-Fri; results are reported within 2-4 days.
Special Instructions:Record time and date collection starts and time and date collection finishes on request form. Complete duration information on the "MML Stool Collection Container" label. Label all containers X of X, e.g., 1 of 2, 2 of 2; and send all containers. A separate order and collection should take place if stool calcium, chloride, magnesium, osmolality, potassium, sodium or any other microbiology testing is also desired.

This test was developed and its performance characteristics determined by Laboratory Medicine and Pathology, Mayo Clinic. This test has not been cleared by the U.S. Food and Drug Administration.

Collection Instructions

Specimen:Feces, 48 or 72 hour collection; 24 hour accepted or random
Optimal Volume:Submit entire collection
Container:Fecal Fat Container
Collection Instructions:Specimen may be refrigerated or frozen during collection. Do not fill the container more than half full (generally, two containers are required).
Patient Preparation:
For 3 days prior to and during the collection period:
  • Patient should be on a fat-controlled diet (100-150 g fat per day).
  • No laxatives (particularly mineral oil and castor oil).
  • No synthetic fat substitutes (e.g. Olestra) or fat-blocking nutritional supplements.
Causes for Rejection:Specimen containing barium, specimen is less than 5 gm.
Contraindications:Patient taking mineral oil. Barium interferes with test procedure; a waiting period of 48 hours before stool collection analysis is recommended. Patient taking fat blocking supplements or synthetic fat.

Processing and Shipping

Specimen Processing:5 grams required for testing. Store in freezer.
Shipping Instructions:Ship on dry ice.
Stability:Comment the collection duration, do not order a collection or weigh the specimen. 24 hour collections are accepted. Approved containers are available upon request from Mayo Medical Laboratories. Send entire collection frozen to Mayo. Samples are stable for 180 days refrigerated or frozen.
Test Performed at or Referral Lab Lab Sendouts  (Mayo)
Referral Lab number:FATF


Reference Range:

Random collection: 0-19% fat

Timed Collection:

17 years or younger

Reference range not established

18 years and older

2-7 g fat/24 hours



Use:Total output of fat per 24 hours after a 3 day collection is a reliable test for steatorrhea. Test does not indicate the origin of the excessive fat excretion. Useful when qualitative fat test is borderline.

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