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Test Code EFPO Electrolyte and Osmolality Panel, Feces

Reporting Name

Electrolyte and Osmolality Panel, F

Useful For

Workup of cases of chronic diarrhea

 

Diagnosis of factitious diarrhea (where patient adds water to stool to simulate diarrhea)

Profile Information

Test ID Reporting Name Available Separately Always Performed
NA_F Sodium, F No Yes
K_F Potassium, F No Yes
CL_F Chloride, F No Yes
OSMOF Osmolality, F No Yes
MG_F Magnesium, F No Yes
OG_F Osmotic Gap, F No Yes
POU_F Phosphorus, F No Yes

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type

Fecal


Specimen Required


Collection Container/Tube: Stool container (T291)

Specimen Volume: 10 g

Collection Instructions: Collect a very liquid stool specimen.

Additional Information:

1. Do not send formed stool. In the event a formed stool is submitted, the test will not be performed. The report will indicate "A formed stool specimen was submitted for analysis. This test was not performed because it only has clinical value if performed on a watery stool specimen."

2. Osmolality results will be reported as mOsm/kg regardless of collection duration.

3. Sodium, chloride, and potassium will be reported as mmol/L

4. Magnesium and phosphorus will be reported as mg/dL


Specimen Minimum Volume

5 g

Specimen Stability Information

Specimen Type Temperature Time
Fecal Frozen (preferred) 14 days
  Refrigerated  7 days
  Ambient  48 hours

Reference Values

No established reference values

Day(s) and Time(s) Performed

Monday, Wednesday, Friday; Evening

CPT Code Information

82438-Chloride

83735-Magnesium

84302-Sodium

84100-Phosphorus

84999 x 2-Osmolality, Potassium

LOINC Code Information

Test ID Test Order Name Order LOINC Value
EFPO Electrolyte and Osmolality Panel, F In Process

 

Result ID Test Result Name Result LOINC Value
NA_F Sodium, F 15207-4
K_F Potassium, F 15202-5
CL_F Chloride, F 15158-9
MG_F Magnesium, F 29911-5
OG_F Osmotic Gap, F 73571-2
POU_F Phosphorus, F In Process
OSMOF Osmolality, F 2693-0

Method Name

OG_F: Calculation

NA_F, K_F, CL_F: Indirect Ion-Selective Electrode (ISE) Potentiometry

OSMOF: Freezing Point Depression

POU_F: Photometric, Ammonium Molybdate

MG_F: Colorimetric Titration

Test Classification

This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.