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Stool Tests: Normal Values

By

Osvaldo Padilla

, MD, MPH, Texas Tech Health Science Center;


Jude Abadie

, PhD, Texas Tech University Health Science Center

Last full review/revision Dec 2021| Content last modified Dec 2021
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Reference values vary based on several factors, including the specific laboratory that supplies them. A patient's stool test values should be interpreted based on the reference value of the laboratory in which the test was done; the laboratory typically provides these values with the test result. These values are listed in alphabetical order in the following table.

Table

Representative Laboratory Reference Values: Stool

Test

Conventional Units

SI Units

Fat

< 5 g/day in patients on a 100-g fat diet

Nitrogen

< 2 g/day

Urobilinogen

40–280 mg/24 hours

68–473 mcmol/24 hours

Weight

< 200 g/day

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