Fecal Fat and Muscle Fibers, Qualitative

CPT: 82705; 89160
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Test Details

Synonyms

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

Test Includes

Qualitative fat (total and neutral) and muscle fibers

Use

Evaluate malabsorption syndromes, pancreatic exocrine dysfunction, or gastrocolic fistula

Methodology

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

Specimen

Stool (random)

Volume

3 g

Minimum Volume

1 g

Container

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.

Collection

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

LOINC® Map

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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The LOINC® codes are copyright © 1994-2017, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf