Fecal Fat

Fecal Fat is a topic covered in the Davis's Lab & Diagnostic Tests.

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Synonym/Acronym:
Stool fat, fecal fat stain.

Rationale
To assess for the presence of fat in the stool toward diagnosing malabsorption disorders such as Crohn disease and cystic fibrosis.

Patient Preparation
There are no fluid or activity restrictions unless by medical direction. Instruct the patient to ingest a diet containing 50 to 150 g of fat for at least 3 days before beginning specimen collection. This approach does not work well with children; instruct the caregiver to record the child's dietary intake to provide a basis from which an estimate of fat intake can be made. Instruct the patient not to use laxatives, enemas, or suppositories for 3 days before the test. As appropriate, provide the required stool collection container and specimen collection instructions; the test may require either a random specimen or a 72-hr collection. A large, clean, preweighed container should be used for the timed test. A smaller, clean container can be used for the collection of the random sample. Ensure specimen collection for this study is accomplished before any barium procedures are performed.

Normal Findings
Method: Stain with Sudan black or oil red O. Treatment with ethanol identifies neutral fats; treatment with acetic acid identifies fatty acids.

Random, Semiquantitative
Neutral fatLess than 60 fat globules/hpf*
Fatty acidsLess than 100 fat globules/hpf
72-hr, Quantitative
Age (normal diet)
 Infant (breast milk)Less than 1 g/24 hr
 0–6 yrLess than 2 g/24 hr
 AdultLess than 7 g/24 hr; less than 20% of total solids
Adult (fat-free diet)Less than 4 g/24 hr
*hpf = high-power field.

Critical Findings and Potential Interventions
N/A

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