MAGNESIUM, FECES

Code
000.0000
Name
MAGNESIUM, FECES
Category
None
Department
Send-Out
Start Date
Expiration Date
Synonyms
Mg, Feces
CPT Codes
83735
Site
SBMF
Reference Test
44313
ATLAS Test Code

Specimen Information

Type

Stool

Volume

5.0 g

Transport Info

Refrigerated

Fasting Required?
False
Patient Instructions

Sample must be liquid
Do not add saline or water to liquefy sample

Reference Range

Magnesium, Fecal
0-110 mg/dL

Magnesium, Fecal, 24 Hour
0-355 mg/d

Methodology

Spectrophotometry

Clinical Significance

The excessive ingestion of magnesium causes diarrhea. Because magnesium acts as an osmotic cathartic agent, magnesium-induced diarrhea is associated with a high fecal output of magnesium. The upper limits of normal for the fecal output of magnesium is 35 mg/day and for the fecal magnesium concentration, 110 mg/ dL. These levels were established in normal subjects, both when they had normally formed stools and when diarrhea was induced by mechanisms other than increased magnesium ingestion.The fecal output of soluble magnesium that exceeds 35 mg/day or a fecal magnesium concentration that exceeds 110 mg/dL, or both, suggests that magnesium has a major role in the pathogenesis of diarrhea.In the context of a high magnesium output, a fecal magnesium concentration above 240 mg/dL suggests that magnesium is the only cause of the diarrhea. When magnesium output is high, but the fecal concentration is less than 240 mg/ dL, magnesium is not the only cause of the diarrhea.

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