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Stool fat, fecal fat stain.
To assess for the presence of fat in the stool toward diagnosing malabsorption disorders such as Crohn’s disease and cystic fibrosis.
Stool aliquot from an unpreserved and homogenized 24- to 72-hr timed collection. Random specimens may also be submitted.
(Method: Stain with Sudan black or oil red O. Treatment with ethanol identifies neutral fats; treatment with acetic acid identifies fatty acids.)
|Neutral fat||Less than 60 fat globules/hpf*|
|Fatty acids||Less than 100 fat globules/hpf|
|Age (normal diet)|
| Infant (breast milk)||Less than 1 g/24 hr|
| 0–6 yr||Less than 2 g/24 hr|
| Adult||2–7 g/24 hr; less than 20% of total solids|
|Adult (fat-free diet)||Less than 4 g/24 hr|
|*hpf = high-power field.|
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Bladh, Mickey Lynn., and Anne M. Van Leeuwen. "Fecal Fat." Davis's Lab & Diagnostic Tests, 7th ed., F.A. Davis Company, 2017. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425123/all/Fecal_Fat.
Bladh ML, Van Leeuwen AM. Fecal Fat. Davis's Lab & Diagnostic Tests. 7th ed. F.A. Davis Company; 2017. https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425123/all/Fecal_Fat. Accessed March 25, 2019.
Bladh, M. L., & Van Leeuwen, A. M. (2017). Fecal Fat. In Davis's Lab & Diagnostic Tests. Available from https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425123/all/Fecal_Fat
Bladh ML, Van Leeuwen AM. Fecal Fat [Internet]. In: Davis's Lab & Diagnostic Tests. F.A. Davis Company; 2017. [cited 2019 March 25]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425123/all/Fecal_Fat.
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