Fecal Fat and Muscle Fibers, Qualitative

CPT: 82705; 89160
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Test Details


  • Muscle Fiber, Stool
  • Stool Meat Fibers
  • Stool Muscle Fiber

Test Includes

Qualitative fat (total and neutral) and muscle fibers


Evaluate malabsorption syndromes, pancreatic exocrine dysfunction, or gastrocolic fistula


Microscopic examination following staining with Oil Red O. Only fibers with identifiable cross striations are counted.

Reference Interval

• Total fats (neutral fats, soaps, and fatty acids): Normal (<100 droplets/hpf)

• Neutral fats: Normal (<60 droplets/hpf)

• Muscle fibers: Normal (<10 fibers/hpf)

Specimen Requirements


Stool (random)


3 g

Minimum Volume

1 g


Plastic screw-cap vial

Patient Preparation

Patient is required to eat adequate amounts of red meat for 24 to 72 hours before testing. Specimens obtained with a warm saline enema or Fleet® Phospho-Soda® are acceptable. Specimens obtained with mineral oil, bismuth, or magnesium compounds are unsatisfactory. Barium procedures or laxatives should be avoided for one week prior to collection of the specimen.


Do not contaminate outside of container; do not overfill container.

Storage Instructions

Refrigerate at 2°C to 8°C. Do not freeze.

Causes for Rejection

Purgatives other than saline or Fleet®; specimen contaminated with urine; specimen obtained with mineral oil, bismuth, or magnesium compounds; specimen on outside of container


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
049684 Fecal Fat/Muscle Fibers, Qual 016691 Fats, Neutral 12598-9
049684 Fecal Fat/Muscle Fibers, Qual 016709 Fats, Total 2270-7
049684 Fecal Fat/Muscle Fibers, Qual 012393 Muscle Fiber, Stool 2605-4

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