Fecal Fat, Qualitative

CPT: 82705
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  • Fatty Acid, Stool
  • Neutral Fat, Stool
  • Qualitative Fat

Test Includes

Neutral and total fats

Expected Turnaround Time

3 - 6 days

Related Information

Related Documents

Specimen Requirements


Stool (fresh random)


Approximately 3 g

Minimum Volume

0.5 g (Note: This volume does not allow for repeat testing.)


Plastic screw-cap vial


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

Storage Instructions

Refrigerate at 2°C to 8°C.

Stability Requirements



Room temperature

14 days


14 days


14 days

Freeze/thaw cycles

Stable x3

Patient Preparation

Patient should be on a diet containing at least 60 g of fat. The patient should not use suppositories or mineral oil before the specimen is collected. Oily material (eg, creams, lubricants, etc) should be avoided prior to collection of the specimen.

Causes for Rejection

Specimen contaminated with urine and/or water; specimen on outside of container; specimen containing interfering substances (eg, castor oil, bismuth, Metamucil®, barium)

Test Details


Detect the presence of fecal fatty acids and neutral fat. Increases in neutral fat are commonly associated with pancreatic exocrine insufficiency. Increase in stool total fats (neutral fats, soaps, and fatty acids) is likely to be associated with small bowel disease.


This test was developed and its performance characteristics determined by LabCorp. It has not been cleared or approved by the Food and Drug Administration.


Microscopic examination following staining with Oil Red O


Administration of barium, bismuth, Metamucil®, castor oil, mineral oil, or ingestion of oily salad dressing within one week prior to collection of the specimen

Reference Interval

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

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


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
001677 Fecal Fat, Qualitative 43118-9 016691 Fats, Neutral 12598-9
001677 Fecal Fat, Qualitative 43118-9 016709 Fats, Total 42668-4

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